RE: Fuel proofing inside of fuselage.
As with anything in this hobby. The BEST is a point of view. I've had great success with Lusterkote, Since it's on the inside matching color wouldn't be that big a deal. I've had trouble matching colors before, with it but I didn't use the primer or the clear cote, once I did it was fine, except for the mis matched can of paint, I did get em to replace it but what a pain. With this stuff you have to follow the directions of using their primer, their paint and their clear kote to get it to match the monokote[:@] This is true of any specialized fuel proof paint so if you think this as a turn off then fine it sucks, built it works
coverite works good as well. Birate dope is great brush on solution. I still just use thinned epoxy for most situations