Cracking that shows up after epoxy has fully cured is a structural failure, not a cosmetic one — internal stress has exceeded the tensile strength of the hardened material, and the cause is almost always excessive heat during cure or differential movement against the substrate. This guide covers the three main causes of post-cure cracking and genuine solutions for each. 1. Thermal Cracking from Excessive Heat The single largest cause of internal cracking is thermal runaway, or exotherm, which occurs when the chemical reaction generates more heat than the material can dissipate. Cause Resulting Epoxy Problem Explanation Thick pouring (mass effect) Internal cracks, crazing, discoloration In a deep pour, trapped heat causes a rapid temperature spike that can degrade the epoxy and shrink it rapidly, producing spider-web cracks and deep fissures. High ambient temperature Accelerated exotherm Pouring in a very warm environment adds external heat on top of internal exothermic heat, speeding the reaction too quickly and raising the risk of thermal runaway. Fast-curing resin used for depth Rapid failure Fast-set resins are designed for thin layers; using them for thick pours drastically escalates exotherm and will almost certainly cause cracking. Solution: Managing the Exotherm Never exceed the manufacturer's stated maximum pour depth for the specific product — often 1/8 inch for coating resins, or roughly 1.5 inches for deep-pour resins. If more depth is needed, pour in multiple sequential layers, letting each cool and partially cure before the next goes down. For pours over half an inch, use a specialized deep-pour or casting resin formulated with slower, less reactive chemistry that dissipates heat over a longer period. In a hot workspace, placing sealed Part A and B containers in a cool water bath before mixing lowers their starting temperature and helps control peak exotherm. 2. Cracking Due to Substrate Movement Epoxy and its substrate have different rates of thermal expansion and contraction. When the substrate moves significantly and the rigid, fully cured epoxy can't flex with it, cracking follows. Cause Resulting Epoxy Problem Explanation Wood shrinkage from moisture loss Surface or edge cracks Wood shrinks as it dries; rigid epoxy resists that shrinkage, producing stress fractures along joints or edges. Substrate flexing Cracking at stress points A flexible substrate, such as thin plywood or a boat hull, flexes under load while the cured epoxy doesn't, cracking at the point of greatest stress. Solution: Stabilizing the Substrate Acclimate and dry wood substrates fully before pouring, and seal all sides — top, bottom, and edges — with a thin epoxy coat to balance moisture content and reduce movement. For river tables or joints, use a specialized flexible joint filler, or leave a small gap to accommodate minor wood movement without stressing the main pour. Where a substrate is known to flex, a flexible or marine-grade epoxy system with a higher elongation rate absorbs minor movement without fracturing. 3. Cracking Due to Thermal Shock This is rapid cracking caused by a sudden, drastic temperature change applied to fully cured epoxy — moving…

When cured epoxy separates, lifts, or flakes away from its substrate, it isn't a slow failure you can catch and patch mid-cure — it's a bond that never actually formed in the first place, and the cause traces back to surface preparation every time. Delamination is the most serious form of adhesion failure and is almost always caused by a poor mechanical or chemical bond, meaning the epoxy couldn't properly grip the surface. It has to be addressed through meticulous surface preparation before the pour, not after. The Two Main Failures That Cause Peeling Epoxy relies on two types of bonds to stick successfully: the mechanical bond and the chemical bond. Delamination occurs when one or both of these fail. 1. Failure of the Mechanical Bond The mechanical bond is the physical grip liquid epoxy achieves by filling microscopic grooves and pores on the substrate's surface. If a surface, especially non-porous materials like plastic, metal, or previously cured epoxy, is too smooth or glossy, the epoxy has nothing to key into — it cures as a sheet on the surface rather than with it, making it easy to peel away. Any trace of silicone, oil, wax, grease, or dust creates a physical barrier that prevents contact entirely, often resulting in large sections lifting clean off. Some materials, like certain soft plastics, polyethylene, or PTFE, have very low surface energy and are naturally non-stick — without aggressive chemical primers or flame treatment, epoxy will never adhere properly to them and will inevitably peel. 2. Failure of the Chemical Bond This applies specifically to applying a new coat of epoxy over an already-cured coat. Most epoxies have an open, or recoat, window, often 4 to 24 hours depending on the product, during which a new coat bonds directly to the previous one chemically, with no sanding required. Miss that window and the first coat has cured too hard for the chemical reaction to link the two layers. If a previous layer developed amine blush, a waxy film from high humidity, and it wasn't fully removed before the new coat went on, that blush acts as a contaminant preventing the two layers from bonding chemically, and they separate easily. Genuine Solutions for Permanent Bonding Preventing delamination requires a disciplined, two-part strategy: proper surface profiling and absolute cleanliness. 1. Achieving a Strong Mechanical Bond Sanding is non-negotiable for any non-porous or previously cured surface. Use 80 to 120 grit on metal, old paint, or concrete to create a deep, visible scratch pattern or profile. For recoating cured epoxy, sand with 120 to 220 grit until the entire surface is uniformly matte, with no shiny spots remaining. Once sanded, remove every trace of dust: vacuum and wipe down the surface, then immediately follow with a solvent wipe using acetone or denatured alcohol on a clean, lint-free cloth, which dissolves oils and residues. Let the solvent fully flash off before pouring, and don't touch the cleaned surface with bare hands after that final step. 2. Ensuring…

A liquid-metal flow effect that comes out blotchy instead of shimmering evenly almost always traces back to the same root cause: pigment that was never fully broken apart and distributed through the resin before the hardener went in. Achieving uniform color or that flowing metallic look is often the goal of decorative epoxy work, and a splotchy or streaky result signals a breakdown in the pigment mixing process rather than a bad batch of colorant. This is primarily a problem of dispersion and suspension. Understanding Pigment Failure Pigments — pastes, liquid tints, or mica powders — are solids that must be fully integrated into liquid resin. Streaking occurs where localized high concentrations of pigment weren't fully blended in. 1. Issues Specific to Dry Pigment Powders Dry powders often contain clumps or aggregates. Introduced directly into resin without a pre-mix step, the high-viscosity resin can't break them apart, and those clumps get pulled through the pour as visible, unmixed streaks. Many pigments, especially metallics, need to be mixed into a small amount of Part A first as a slurry — skipping or rushing that step leaves the final mix uneven. Dense pigments, especially metallics, can also settle out of suspension if the mixed batch sits too long before pouring, leading to uneven distribution across the piece. 2. Issues with Liquid Tints and Pastes Liquid tints disperse more easily than powders, but a brief, shallow stir still leaves visible streaks of concentrated color, particularly around the cup's edges and bottom. Adding pigment too late — stirring it into an already-mixed and thickening resin/hardener batch — significantly raises the risk of streaking, since higher viscosity resists even distribution. 3. General Mixing Failure The same lazy-stirring problem that causes soft spots causes streaking too: failing to scrape the sides and bottom means unpigmented resin or heavily pigmented sludge sticks to the container wall, and when scraped in later during the pour, that material enters the stream as a visible streak. Genuine Solutions for Flawless Color and Shimmer The fix is a disciplined, multi-stage mixing process that addresses pigment before the chemical reaction begins. 1. The Critical Pre-Mix Stage Always introduce pigment into the measured amount of Part A first, before adding hardener. For mica or metallic powders, measure the powder into a small separate cup, scoop a small amount of Part A into it, and mix that slurry vigorously until no visible dry powder or clumps remain. For liquid tints and pastes, stir into Part A for at least one full minute until the color completely disappears into a uniform liquid. 2. Main Batch Integration Once pigment is fully dispersed in Part A, add the measured Part B to the colored Part A and stir the entire batch for the mandatory 3 to 5 minutes required for a full cure. Scrape the sides, corners, and bottom continuously during that stir — denser metallic pigments are especially prone to settling there, producing a weak color at the start of the pour if missed. 3. Managing…

A surface that's still soft or sticky well past its expected cure window, often 24 to 72 hours, is telling you something specific: the chemical reaction between resin and hardener was incomplete or fundamentally flawed, not just slow. For hobbyists and professionals alike, this issue is nearly always traceable back to improper measurement or mixing technique. Epoxy resin is a two-part system, resin (Part A) and hardener (Part B), that relies on a precise stoichiometric ratio, a precise chemical balance, to achieve a full, hard cure. The Core Problem: Off-Ratio Chemistry Cause Resulting Epoxy Problem Explanation Improper measuring Soft spots or tacky patches Measuring by volume instead of weight, or vice versa, when the product specifies the opposite produces an incorrect chemical ratio, leaving unreacted material that can't harden. Scale errors Widespread tacky film An uncalibrated scale, or one not sensitive enough for small batches, causes significant ratio errors — too much of either part leaves the other unable to complete cross-linking. Mixing components from different products Total cure failure Different epoxy systems have different chemical formulas; never mix Part A from one product with Part B from another, since ratios and chemistries won't align. The Main Culprit: Poor Mixing Technique Even with a perfect ratio, components must be thoroughly and uniformly blended. The most common mixing mistake is failing to scrape the sides and bottom of the mixing container — unmixed material sticking there gets poured onto the project and stays perpetually tacky. Stirring too quickly introduces excessive bubbles, but stirring too slowly or for too short a time, usually under 3 minutes, leaves streaks of pure resin or hardener that become soft, sticky streaks on the final surface. The double-cup method, transferring the mix to a second clean container, is best practice, but failing to fully scrape the first cup or not mixing the second cup thoroughly can still introduce unmixed material. Genuine Solutions for Prevention and Cure 1. Mastering Measurement Always use the ratio and method, weight or volume, specified by the manufacturer — don't substitute one for the other unless explicitly permitted, since the densities of Part A and Part B are often different. For weight ratios, use a digital scale accurate to at least ±1 gram, or 0.1 gram for small batches. For volume ratios, use measuring cups with clear, legible markings. 2. Perfecting the Mix Stir thoroughly and consistently for 3 to 5 full minutes depending on batch size and manufacturer directions — set a timer rather than guessing. While stirring, constantly scrape the sides, corners, and bottom of the container, folding that material back into the center so no unmixed residue contaminates the pour. For large or critical pours, use the double-cup method: mix for 3 minutes in the first cup, transfer all material to a second clean cup, and mix for another 1 to 2 minutes with a new stick, guaranteeing any residue clinging to the first cup stays behind. Stir with a gentle, figure-eight or circular motion to blend the components…

A cloudy, milky finish where you expected a clear pour is a cosmetic defect, not a structural one — and once you understand the chemistry behind it, moisture haze and amine blush are among the more preventable problems in epoxy work. This common surface defect is caused by high humidity or moisture contamination during the epoxy's crucial curing phase, leaving a tacky, dull, or waxy film that ruins the expected glossy clarity. Amine blush is particularly prevalent in systems using amine-based hardeners, one of the most common hardener chemistries, and is essentially a chemical byproduct of a disrupted cure. Understanding the Cause: The Chemistry of the Cloud Amine blush and moisture haze form when moisture, either from high ambient humidity or direct surface contact, reacts with the hardener component of the mix. 1. The Amine Blush Reaction The amines in epoxy hardener are hygroscopic, meaning they readily absorb moisture from the air. During the exothermic curing reaction, those amines react with carbon dioxide and ambient moisture in the air, forming a waxy, water-soluble film of carbamates on the surface. That film prevents the epoxy from reaching its full hardness, leaving it sticky, cloudy, or milky exactly where the reaction was disrupted. 2. Moisture Contamination If the substrate, especially wood or concrete, has a high moisture content, that moisture can leach out as the epoxy heats during cure, producing localized cloudy or milky patches. Direct water contact — a splash landing on liquid epoxy during the early cure — causes immediate, irreversible clouding at that exact spot. Both mechanisms tend to produce a similar-looking milky patch, which makes them easy to confuse when diagnosing a defect after the fact. One useful distinguishing clue: blush from ambient humidity is typically spread fairly evenly across the whole exposed surface, since the entire piece was exposed to the same air, while moisture leaching from a substrate tends to show up as an irregular patch that roughly follows the grain pattern or a specific damp area of the material underneath. Genuine Solutions for Prevention and Cure Preventing moisture haze and blush is considerably easier than repairing it, and the fix centers on environmental control and proper surface cleaning. 1. Environmental Control Keep relative humidity in the workspace below 60% for the entire cure cycle, especially the first 6 to 10 hours, the most vulnerable period — a dehumidifier or climate-control system brings RH down when needed. Cure at the manufacturer's recommended temperature, often 70–75°F (21–24°C); warmer temperatures speed the reaction through its vulnerable stages faster, which helps minimize blush formation. Acclimate resin, hardener, and substrate to the working temperature before mixing and pouring to avoid cold surfaces that encourage condensation. 2. Substrate Management Use a moisture meter on wood to confirm moisture content is within the acceptable range, typically below 10–12%, before sealing or pouring. Apply a seal coat to wood or concrete to lock in residual moisture and keep it from migrating into the fresh epoxy layer. 3. Repairing Amine Blush After the Cure…

Poor adhesion, peeling, cloudy patches, and inconsistent textures share a common root cause more often than any other single factor — a substrate that was never adequately sanded, cleaned, or primed before the epoxy went on. For hobbyists, DIY builders, and industrial users alike, understanding the "why" behind proper prep is the best defense against epoxy failure. Epoxy needs a specific surface environment to bond chemically and cure uniformly, and neglecting any of the three key stages — sanding, cleaning, and priming or sealing — creates vulnerabilities that show up later as defects. The Three Pillars of Prep and Their Associated Problems 1. Sanding: The Mechanical Bond Sanding provides the "tooth," the mechanical profile a liquid epoxy needs to grip the substrate. Preparation Failure Resulting Epoxy Problem Explanation No sanding (glossy surface) Poor adhesion, delamination Epoxy struggles to bond to smooth, glossy, or non-porous surfaces, curing as a sheet on the surface rather than with it — easy to peel off. Common on cured epoxy layers and plastics. Wrong grit used Visible scratch marks or weak bond Too coarse a grit (60) can leave scratches the epoxy won't self-level over; too fine a grit (800) may not create enough profile for a strong mechanical bond. The ideal target is a matte finish — a good mechanical profile without deep, visible scratches. A final pass with 120–220 grit sandpaper gives the best balance of adhesion and texture for most epoxy topcoats. 2. Cleaning: The Chemical Barrier Residue left on a surface acts as a chemical barrier, preventing epoxy from making direct contact and leading to localized rejection. Preparation Failure Resulting Epoxy Problem Explanation Contaminants left behind Fisheyes, craters, dimples, white spots Oils, fingerprints, silicone, wax, dust, or soap residue break the surface tension of liquid epoxy, causing it to pull away from those spots. Improper cleaning solvents Haze, cloudiness, or sticky patches Household cleaners or poor-quality solvents can leave a trace chemical film that interferes with the cure if it hasn't fully evaporated. Leaving sanding dust Textured, gritty finish, loss of clarity Fine dust particles suspended in the epoxy reduce transparency and leave a rough texture even on a level surface. 3. Priming and Sealing: Outgassing and Absorption Control Priming or sealing is essential for porous or temperature-sensitive substrates like wood, concrete, or foam, since it manages air release and inconsistent absorption. Preparation Failure Resulting Epoxy Problem Explanation No seal coat on porous substrate Persistent bubbles and craters Heat from the main flood coat expands trapped air in the substrate, which bubbles out through the liquid epoxy and can leave craters as it gels. High moisture content in wood Cloudy patches, amine blush, poor cure Excess moisture interferes with curing chemistry or leaches out during the exotherm, producing widespread texture issues. Substrate absorption differences Splotchy or patchy appearance Different areas — end grain versus face grain, for example — absorb resin at different rates, curing unevenly if unsealed. Genuine Solutions: The Prep Checklist 1. Achieve the Mechanical Tooth Start with a…

A crater that exposes bare substrate through an otherwise perfect pour has one root cause almost every time — contamination — and tracing it down is more reliable than guessing at a fix. Fisheyes, splotches, weird textures, and small round defects are among the most frustrating issues in epoxy work. Similar to dimples, these defects are almost always the direct result of contamination — a localized surface-tension failure where liquid epoxy retreats and pulls away, leaving a crater-like defect that often exposes the substrate beneath. Controlling contamination is the key to a consistently smooth, professional finish. Why Fisheyes and Splotches Appear The phenomenon where epoxy pulls away from a contaminated spot is known as crawling or cratering. It happens because the surface energy of the contaminant, such as oil, is much lower than the surface energy of liquid epoxy, causing the resin to be repelled. 1. Silicone and Oil Contamination This is the most frequent and persistent cause. Trace amounts of mold-release wax, spray silicone lubricants, or furniture polish transferred from hands, tools, or the air are common culprits. Silicone can travel surprisingly far through HVAC systems or drafts — if a silicone caulk was used nearby, or aerosol cooking sprays are in use, particles can settle on wet epoxy from across a room. Reused mixing cups or dirty stir sticks carry residue from previous projects, and fingerprints, hand lotions, skin oils, or machine lubricants on the substrate itself are just as effective at causing the defect. 2. Moisture and Humidity Less common for sharp fisheyes but still a factor: if the substrate, especially wood, has high moisture content, that moisture leaches out during the epoxy's exothermic cure and disrupts the surface, producing a splotchy, uneven texture. High ambient humidity can react with amine-based hardeners directly, producing a hazy, waxy film known as amine blush — not technically a fisheye, but a related weird-texture problem. 3. Substrate Outgassing This typically produces a pattern of small, round defects resembling permanent bubbles or craters. Porous materials — wood, concrete, composites — contain trapped air that expands as the exothermic cure heats the substrate, pushing out through the liquid epoxy and creating a bubble that, once popped, may leave a crater that doesn't fully collapse before gelling. Without a preliminary seal coat on a porous material, outgassing during the main flood coat is essentially inevitable. Genuine Solutions for Flawless Epoxy Surfaces Eliminating fisheyes and texture issues takes a multi-pronged approach focused on cleanliness, preparation, and technique. 1. Zero-Tolerance for Contamination Before pouring, meticulously wipe the substrate with a clean cloth and a recommended solvent — acetone or denatured alcohol — using only high-purity product and waiting for full evaporation before applying epoxy. Keep every nearby item clean, including gloves and tools, and wear non-powdered nitrile gloves to avoid transferring skin oils or lotion. Isolate the workspace from silicone sealants, spray lubricants, and even air fresheners during the pour and cure. 2. Substrate and Moisture Management For wood, concrete, or other porous materials, always…

Small, shallow depressions appearing across an otherwise good pour aren't a sign of bad epoxy — dimples and puckering trace back to a specific, identifiable set of environmental or application conditions, and every one of them is preventable. Epoxy resin works well for everything from river tables and encasing precious items to durable industrial coatings, which makes surface defects like dimples especially frustrating when they appear after the cure is otherwise complete. For hobbyists, DIY builders, and industrial users alike, understanding the root cause is the first step toward a consistently smooth, glassy finish. Understanding the Enemy: What Causes Dimples and Puckering Dimples and puckering are typically caused by surface tension issues and curing-rate disparities across the epoxy's surface — think of a liquid trying to pull itself taut while something interferes with that even pull. The main culprits fall into three categories. 1. Contamination and Surface Tension Disruption The most common cause is a disruption in the liquid epoxy's uniform surface tension. Epoxy naturally wants to level out smoothly, but contaminants create areas where it recoils or pulls away. A burst bubble sometimes leaves a small crater that high-viscosity epoxy doesn't fully flow back into before gelling, especially in thick pours or when work moves too quickly. A trace of grease, silicone, mold-release agent, or wax on a container, tool, or substrate will repel epoxy from that spot, producing a permanent dimple or the larger version of the same defect, a fisheye. Even dust or fine particulates settling on the wet surface can locally alter surface tension enough to start a dimple as the epoxy cures around it. 2. Environmental Factors The air around a curing piece can dramatically affect the outcome. Drafts and uneven airflow — from an open window, fan, or AC vent — cause one part of the surface to cure faster than another; the faster-curing area develops a skin that puckers or pulls against still-liquid areas, producing ripples and dimples. Significant temperature gradients across the surface, or between the epoxy and the ambient air, lead to uneven curing and the same kind of surface imperfection. 3. Application and Mixing Issues Sometimes the problem starts before the pour. Using a torch or heat gun too close, too slowly, or with too much heat in one spot can superheat the epoxy locally, altering its chemistry enough to leave a slight depression as it cures. Over-spraying denatured alcohol or isopropyl alcohol to pop bubbles is a common but risky technique — too much dilutes the epoxy and interferes with the reaction, resulting in puckered, matte, or dimpled areas. Genuine Solutions: How to Achieve a Smooth Cure No new product is required — these practical steps eliminate dimples with the epoxy you already have. 1. Preparation and Cleanliness Meticulously clean the substrate before pouring: remove all sawdust from wood, and wipe other surfaces with a compatible solvent like acetone or denatured alcohol, letting it fully evaporate. Never use Windex, dish soap, or anything containing emollients or waxes. Keep mixing…

Bubbles can appear from nowhere and quietly ruin an otherwise perfect pour, but they only ever come from two sources — and once you know which one you're fighting, eliminating them is a matter of technique, not luck. Air bubbles are one of the most persistent problems anyone working with epoxy resin encounters, compromising clarity, strength, and overall finish. They fall into two categories: entrained air, introduced during mixing and pouring, and outgassing, released from the substrate itself. A bubble-free finish requires addressing both. 1. Stopping Entrained Air: Slow Mixing and Warming Entrained air refers to the microscopic bubbles whipped into liquid epoxy during mixing, and they're difficult to eliminate once trapped in a highly viscous mixture. Rapid, energetic stirring, or improper tools like high-speed drill mixers, folds excessive air into the resin and creates a foam-like mixture that's nearly impossible to fully degas by hand. Mix slowly and deliberately with a flat-edged stick, using a gentle, continuous folding motion rather than lifting the mixer out of the material or whipping the top layer — think stirring honey, not whisking cream. Warming both resin and hardener bottles in a water bath at 70–80°F (21–27°C) for 5 to 10 minutes before mixing lowers viscosity, making the mixture easier to stir without introducing bubbles, and letting any bubbles that do form rise to the surface faster. Pour slowly and carefully, letting the stream run down the side of the cup or mold; pouring from a slightly greater height can thin the stream and pop a few bubbles as it falls, but pouring too fast still introduces air. 2. Preventing Outgassing: Sealing the Substrate Outgassing occurs when porous materials, most often wood — especially live-edge slabs — or concrete release trapped air into the warming epoxy. The exothermic cure reaction heats the substrate, expanding trapped air in its pores and pushing it up into the resin layer. An unsealed, porous surface behaves like a sponge full of tiny air pockets, and as the reaction heats up, that trapped air pushes continuously through the liquid resin. The fix is a seal coat: apply a thin, small batch of epoxy to the porous surface first, brushed or squeegeed thoroughly in. Let this seal coat outgas completely, using gentle heat to pop any rising bubbles — because the layer is thin, bubbles escape it easily. Wait for the seal coat to reach the tack-free stage, sticky like tape but not transferring to a finger, before proceeding with the main flood coat or deep pour onto what is now a non-gassing surface. 3. Removing Surface Bubbles in the Liquid Pour Even with good preparation, some bubbles will surface, and you have a short window — the pot life — to remove them before the resin gels. Tiny bubbles often rise but fail to pop because of the resin's own surface tension. A heat gun or propane torch, swept gently and continuously across the surface without lingering in one spot, is the most effective fix: heat lowers viscosity…

Epoxy is a liquid, and gravity always wins unless you plan for it — coat a vertical edge the same way you'd coat a flat surface and you'll end up with runs, drips, and an unsightly bead along the bottom lip every time. This issue, often called sagging or curtaining, isn't a sign of bad material; it's a challenge tied to viscosity, application technique, and timing. Understanding those three factors is what separates a clean, professional edge from a drippy mess. The Science of Sagging: Why Does Epoxy Flow? All liquid epoxies have viscosity, a measure of resistance to flow. Low-viscosity epoxies, thinner and more watery, work well for deep pours and self-leveling but are highly prone to running on vertical surfaces. High-viscosity epoxies, thicker like honey or syrup, resist gravity better but may not self-level as smoothly. Runs and drips happen when the sheer force of gravity overcomes the epoxy's surface tension and its rising viscosity during cure. 1. The Critical Factor: Viscosity and Formulation The type of epoxy you choose is the first line of defense against runs. Using a standard, low-viscosity casting or river-table epoxy on a vertical edge will inevitably drip, because that formulation is designed to flow freely and self-level. Applying too thick a coat in a single pass, before it has time to set up at all, produces the same cascade of drips regardless of formulation. For vertical applications — bonding coves, fillets, or coating a wall — use a specialized high-viscosity or thixotropic epoxy. Thixotropic resins thin out when agitated but quickly thicken again once left alone, letting them resist gravity between applications. If you must use a standard coating resin on a vertical edge, incorporate a commercial thickener, such as fumed silica, to turn the liquid into a non-sagging gel or paste — thicken only the amount needed for that section. For general edge coating, plan on multiple thin coats rather than one thick coat; thin coats cure faster and give gravity less time to act. 2. The Importance of Application Technique How you apply epoxy to an edge drastically affects how severe any runs turn out to be. Overloading a brush, roller, or spreader with too much material, or applying a coat that's simply too thick for the product's natural resistance to gravity, are the two most common mistakes. Apply the minimum coat necessary for coverage, slowly and evenly. After coating the top surface, epoxy that rolls over the edge will accumulate at the bottom lip — wipe away that accumulating bead every 5 to 10 minutes during the initial 30 to 60 minutes of cure, using a clean stick, brush, or gloved finger, before it builds enough mass to form a real run. Feathering the epoxy up toward the edge from underneath, rather than only brushing down from the top, also helps push material against gravity instead of with it. 3. Mastering the Timing of the Cure The change from liquid to gel is your greatest ally against sagging. Trying…