I don't think any of the Dupli-color clears are fuel proof. I use a lot of Dupli-color products, but only the lacquer for color. The lacquer has to be clear coated and I use auto catalyzed clear. My understanding is that the enamel colors may be fuel resistant, but the clear enamel is not.
Regarding Minwax, the water based product is called Polycrylic, the solvent based is Polyurethane. Polycrylic is not fuel resistant. Polyurethane is heavy and will yellow a little over time.
I suggest using the clear catalyzed spray can product Charles has found and reviewed in a recent thread. I am considering this for my next project. Hoping to get away from the auto paint. Difficult to use and very expensive. KBS receives good reviews, but I have never tried it.
Paul