RE: covering cowling
Only time I have had paint bubble and peel was when I use the wrong paint/prime combo. That sure messed up what was starting to look good too. If you can try getting your paint at A hobby shop, testors or mid wets, maybe ultracote?? That is if you can find A match to your covering. If you can't then try what Don said. It takes about 10 days or so for that paint to set up to be fuel proof but it does A good job. That rust paint works too but watch the prime!!