Both cure fast, both come as a single component, and both bond a wide range of materials. The differences that matter show up in working time, cure depth, clarity, and what happens to the joint months later. Matching the adhesive to the joint prevents rework. How each one cures Super glue, or cyanoacrylate, polymerizes on contact with surface moisture. Once the parts touch, the clock is running, and a thin film sets in seconds whether you are ready or not. UV glue holds liquid until light of the right wavelength reaches its photoinitiator, then crosslinks in seconds. You control when the cure starts, so alignment and clamping happen at your pace. Where super glue fits Fast repairs and general assembly where parts fit closely and align easily Bonding rubber, many plastics, wood, and metal without a light source Small-gap joints under 0.1 mm; gel grades stretch that to about 0.25 mm Applications where equipment cost has to stay near zero Its weaknesses are well known: sharp odor and blooming from monomer vapor, brittleness under peel and impact unless a toughened grade is used, and reduced strength after long exposure to water or high humidity. Where UV glue fits Joints where at least one part transmits UV or visible light, especially glass and clear plastics Assemblies that need careful positioning before an instant set Heat-sensitive electronics and optics that cannot go through an oven Bond lines that must cure water-clear with low shrinkage A cure-speed comparison against two-part systems is in which adhesive dries faster for quick repairs, and clarity-critical joints are covered in which adhesive is better for transparent bonding. UV glue's constraint is the light path. Opaque parts, deep sections, and shadowed areas will not cure unless the grade also cures by moisture or heat as a secondary mechanism. Email Us with your parts and we will tell you which chemistry suits the joint. A quick decision guide Both parts opaque, close fit, no light source: cyanoacrylate One part is glass or clear plastic, cosmetic bond line: UV adhesive, see the best UV glue for glass Long open time needed for alignment: UV adhesive Wet or humid service environment: neither is ideal; consider a structural epoxy Wide gap fill: gel cyanoacrylate for small gaps, epoxy for anything larger Strength, durability, and aging On a well-prepared close-fitting joint, standard cyanoacrylate reaches lap-shear strength of roughly 2,000 to 3,800 psi and sets in seconds, but a rigid grade is brittle under peel and impact and loses strength after long exposure to water, heat above about 80°C, or polar solvents. Toughened and elevated-temperature grades push those limits at some cost in cure speed. A correctly cured UV acrylate reaches roughly 1,500 to 3,000 psi on glass, shrinks less than 3 percent, and tolerates service temperatures around 120 to 150°C. Its durability depends entirely on delivering the full light dose; an underexposed joint looks finished but fails early. Neither chemistry is the first choice for continuous water immersion or wide humidity swings. For…