I also used Jet Flex on my interior (sandy-beige). It seemed to be sensitive to the dilution with water, too much and you get some good runs, but once you get that figured out, it works well with the HVLP. Otherwise, I had a good semi-gloss and although it's not perfect, it seems to be a really tough paint. I did the interior just prior to starting final assembly of the interior components and wiring, and I'd say the scratches are minimal. I had previously used DP48LF (white epoxy) for teh primer, and once it was lightly sanded and wiped down, the Jet Flex adhered without a problem. I have yet to have any peeling. Fuel and brake fluid don't seem to have an impact. It's easy to clean up, being water based, but you want to clean up as soon as you can because that stuff is tough to get off the gun.