I don't think anything is truly fuel proof except metal and some plastics. By that I mean if you put any of the so-called paints or glues in a bottle of fuel, they would break down.

But epoxy is fuel proof for a long time, so unless you drench the engine compartment with raw fuel and it sits there, then you won't have any problems with it.

Fuel proof and exhaust proof aren't the same thing, btw. Fuel proof means raw fuel proof. A lot of things that can hold up to the oily exhaust break down to raw fuel.

- Paul