Not so much of an answer but a lead off question of my own here .....

I have used Klass Kote and a bunch of the older but similar K&B SuperPoxy over solid surfaces but never over open bay fabric. Is Klass Kote flexible enough for long term use over fabric without cracking? It is certainly a good product.

I have used Stits paints before with good results and I know it is flexible. Not as shiny as the epoxy paints when sprayed but it can be buffed to a very nice finish. Some advantages of the Stits process are it's ease of repair if needed and the paint doesn't require a catalyst.

Another paint process that I have used is the automotive urethanes. The single stage, catalyzed products are very flexible and have a high, resistance to most any fuel. The basecoat / clearcoat products are not quite as flexible as the single stage types but offer a shine and depth that can't be matched by any other process. I prefer Urethane clears over any base including Klass Kote if a top coat is needed.