Why We Use IR Curing for Aviation Coatings
When you’re building a plane, you have to think about the worst-case scenarios. Bird strikes. Gravel kicking up from a runway. Things that hit a fuselage at high speeds. In those moments, you don’t want your coating to just “be there”—you need it to soak up that energy without cracking. That’s where infrared (IR) heating comes in. It’s a different beast than those old-school convection ovens.
The Secret is in the Bond
Here’s the thing about IR: it doesn’t just heat the air around the part; it goes straight into the coating. This makes the polymerization happen faster and, more importantly, more evenly. If you let a coating cure too slowly in a chilly workshop, you end up with internal stresses. Think of it like a coiled spring waiting to snap. When a piece of debris hits a stressed surface, the paint just chips away. But when you use IR, the coating stays flexible. It flexes. That’s the difference between a small scuff and a bird strike peeling your paint right down to the aluminum.
Making it Work on the Floor
Now, you can’t just point a heat lamp at a plane and hope for the best. You have to be careful. If you blast the skin too hard, you’ll warp the panel or ruin the bond with the primer. It’s a balancing act. We usually lean on short-wave IR when we need the surface to set quickly, and medium-wave when we need the heat to sink deeper into those thicker primer layers.
The Catch
IR isn’t a magic wand. You’ve got to get the distance exactly right. If your emitters are too close, you’ll get “hot spots.” Those little patches become brittle, and that’s where the failure starts. To stop that from happening, you need a closed-loop temperature system. You want to keep that surface temperature within a tight 5-degree window. Without a solid sensor array, you’re basically just guessing. And in aviation, guessing is a bad idea.