This is the best you can buy. It must be sprayed in a booth with protective gear. But the chassis will NEVER corrode. Especially if you paint the chassis with a topcoat of say, epoxy white or gray. I'm thinking originals were bare but you have put so much time and effort into this it may be something you want to consider. Is it ALCLAD aluminum? In other words, does the sheet stock you have been using covered with a layer of pure aluminum?BTW...if you have any particular recommendations for coating the ally sheets I´d be grateful.