Something that a friend (Perry Rose) told me about is Dupli-Color wheel clear, I don't remember the part #, but it is fuel resistant.
I had a.25 powered Sky Ray that I shot with Rust-o-leum white, then sprayed the Dupli-Color wheel clear on it and it was successful, however let the Rust o leum dry for a couple to three weeks first, then let the Wheel clear dry for a few days.
It worked for me.. If I can I will get the Duplicolor part # and post it.
I got the wheel clear at a local NAPA store...