I have tried Krylon with fuel, 10%, and it doesn't even come close to being fuel proof. The best clear I have found is the death paint clear, and that is what I have used on my custom guitars for the past five years with no problems from any customers. I like it for the instruments because it meets the requirement of flexing with the wood expanding/shrinking. I like it better than nitro-cellulose lacquer because I don't have to wait 6 weeks before I sand and buff it! (That caused me no end of impatient clients waiting for their instruments!)
But...I still had that one time where I should have misted it on the ink lines before the first medium coat.
By the way Dennis, I love your Yosemite Sam! Had that one on my old Ruffy years ago - he's sort of a hero for me! Are you building mostly acoustic, or electric, or both?