Getting Aircraft Wing Coatings to Set Right with IR Arrays
Heating up an entire hangar just to dry some paint is a waste of time and money. That’s why we use infrared (IR) array systems. Instead of warming the air, these arrays shoot heat straight into the coating. It pushes the solvents out faster and gets the chemistry moving so the finish actually sets.
The Balancing Act of Curing
The whole point here is making sure the wing can take a hit—think bird strikes or pebbles kicking up from the runway. If you let the coating dry too slowly, it stays soft. Too fast? You get “skinning,” where the top hardens but the solvents get trapped underneath. It’s a mess. We set these arrays to ramp up the heat gradually. By tweaking the wavelength and intensity, the heat sinks deep into the paint, not just the surface. This builds a tight, dense molecular structure. When something hits a wing with a dense cure, the energy spreads out and dissipates. If it’s under-cured and porous, it just cracks.
How We Set Them Up (and Where it Goes Wrong)
Wings are huge, so we use modular arrays to cover the area. You can’t just blast the surface with one massive heat source—you’ll scorch the composite materials underneath. That’s why we use zoned controls. It lets us keep the temperature steady across the leading edge and the main body of the wing. Now, high-intensity IR is great for fast turnarounds. But there’s a catch. If the coating gets hot way faster than the wing structure itself, you’re asking for trouble. You’ll see micro-cracks or the paint might even peel away from the wing. You have to keep the heat ramp in sync with how the wing material expands.
Keeping Things Running
A quick heads-up on the install: you need heavy-duty shielding on the wiring. Otherwise, the electromagnetic interference will play havoc with your hangar electronics. And don’t forget the mirrors. Give the reflectors a good clean every 500 hours. When dust builds up, the heat doesn’t transfer as well. The lamps then have to run hotter to make up for it, which burns out the filaments way sooner than they should.