Paul,
I suspect if you flooded a "finished" surface with raw fuel over time it could probably damage/penetrate (??) any finish depending on the material. I'm, however, referring to raw fuel splashing onto a hardened catalyzed topcoat finish like the KBS Diamond product or an auto finish two-part urethane. In my experience there is no damage such as dulling, discoloring or lifting. Using these harder finishes provides much better or safer protection to a custom paint job. Even Acetone has little effect. I have seen many here refer to them as "fuel resistant or fuel proof." Of course, we can't leave out the added weight price we pay to have the better protection.
Steve