I used to do the thinned epoxy thing on my engine compartments and back into the fuel tank area. As I've become older and not wanting the kids to have to wade through so much old man clutter.... RC Hoard, etc..... when I pass, I've been using this old can of Sig Supercoat. It's a silver color and ensures everything I build gets silver Blech marks everywhere it shouldn't be and all over my fingers too! But its ready to use after a few stirs! Been using it in retract bays, Split Flap bays etc. Still a third of a can left. Had it so long I don't remember how I got it and it still may be there for the kids to toss when I die. Or use maybe????