HVOF and plasma spray coatings only protect what they’re supposed to cover — everything else depends on a mask that can survive a high-velocity, high-temperature particle stream without flinching.
High-Integrity Masking for HVOF and Plasma Spray
Industrial applications in aerospace, power generation, and automotive sectors rely on thermal spray coatings — specifically air plasma spray and high-velocity oxygen fuel (HVOF) — to impart extreme hardness, corrosion resistance, and thermal insulation to critical components. The success of these coatings hinges on precision masking. Traditional masking solutions, including tapes, foils, and mechanical fixtures, falter under the intensity of the thermal spray environment. They’re susceptible to edge lift, material breakdown, and blow-off from the aggressive, high-velocity particle stream, leading to costly rework.
Manufacturers need a solution that offers speed, clean removal, and mechanical resilience. Light-curable peelable masks address each of these requirements directly.
Why Light-Curable Masking Suits Thermal Spray Operations
Rapid curing. Near-instantaneous solidification under UV or visible light — typically within seconds — dramatically shortens cycle times compared to heat-cure or air-dry options.
Mechanical resilience. Once cured, the mask forms a tough, rubber-like barrier capable of resisting the elevated temperatures and severe abrasion of the spray process.
Residue-free removal. The mask peels away cleanly in one piece, eliminating the need for time-consuming, environmentally problematic solvent cleaning or post-processing steps.
For both HVOF and plasma spray masking, a gel-consistency formulation with high impact resistance and film thickness capability tends to perform best, since it needs to withstand both severe mechanical impact from the particle stream and the chemical agents sometimes used in surface preparation before spraying.
Implementing Light-Curable Masking in Three Steps
- Dispense and apply — a thick, gel-consistency masking material can be precisely applied via syringe, automated dispensing equipment, or screen printing to achieve exact coverage on complex geometries
- Cure in seconds — the mask cures rapidly using a high-intensity UV or UV LED light source, securing it to the surface without the need for thermal ovens
- Spray and peel — complete the HVOF or air plasma spray coating, then remove the mask by hand once finished, leaving a cleanly protected surface
If your operation is evaluating light-curable masking for a thermal spray application, Email Us — our team can help match a formulation to your specific coating process and substrate.
Frequently Asked Questions
Q: Can a light-curable mask withstand the heat generated during HVOF spraying itself, not just the particle impact?
A: Masking materials are generally positioned away from the direct spray plume’s highest heat zone by the masked geometry itself; confirm the specific formulation’s thermal tolerance against your process parameters, since direct plume exposure differs from ambient heat buildup near the spray zone.
Q: How does mask thickness affect impact resistance during spraying?
A: Thicker gel applications generally provide greater impact resistance and film integrity, though they also require longer cure exposure to fully polymerize through the material’s depth — balance thickness against your specific curing equipment’s output.
Q: What’s the most common cause of mask failure during thermal spray masking?
A: Edge lift from inadequate surface preparation before mask application is the most frequent failure mode; ensuring the substrate is clean and dry before dispensing is as important as the mask formulation itself.
Understanding UV Curing Fundamentals
For teams building out a thermal spray masking process from scratch, an industrial guide to UV lightguide systems explains how UV curing energy is generated and delivered, which is foundational to understanding cure consistency across a production run. It’s also worth reviewing what causes UV light guide degradation over time to build preventive maintenance into your curing equipment before inconsistent cure becomes a masking-quality problem.
Coordinating Masking With Spray Booth Scheduling
Thermal spray booths run hot and dusty, and the masking step usually happens on a separate station before parts enter the booth queue. Building a buffer of pre-masked, fully cured parts ahead of the booth schedule helps decouple masking throughput from spray-booth throughput, so a masking-station slowdown doesn’t idle an expensive HVOF or plasma spray cell waiting on masked parts. Conversely, curing a mask too far in advance of spraying, especially in a shop environment with airborne dust or oil mist, can leave a cured mask’s surface contaminated before it ever reaches the booth — so a reasonable time window between masking and spraying is worth establishing and enforcing as a process control, not left to whatever the schedule happens to produce.
Securing Coating Quality
For industrial operators focused on high-quality HVOF and air plasma spray masking, a light-curable peelable mask offers strong mechanical protection, reliable adhesion, and meaningful cycle-time efficiency compared to legacy masking methods.
Contact Incure to learn more about implementing light-curable masking in your thermal spray production line — Contact Our Team.
Visit www.incurelab.com for more information.