If you want to use Krylon on anything with an engine, I 'd suggest testing it for fuel resistance, first. In fact, one of my experiences with Krylon, I made upp some test patches on balsa frameworks, put raw fuel on them , and allowed to set for a couple days. Painted my Staerling F-4U-1 with the early 3 tone blue and gray. Got down from the first flight, and the Krylon had disolved where the exhaust hit it. It might have been fuel proof, but was definitely NOT hot fuel proof.