I use the same mix for gasoline that I use fot glow - 30 minute epoxy thinned with about 20% acetone. It seems to hold up as well to gasoline - but then I am more gareful, generally, and little dribbles exaporate quickly. I also use a Jersey Modeler Fueler that has a take-up line so there is no overfill squirt.

Really can't say if it would hole up to long term pooling as in a tank leak. However, with gasoline you know it almost immediately if the model is near you from the odor of spilled gas.

If you are real worried an automotive primer or enamel would be gasoline safe. I also know folks who topcote giant scale fabric with polyurethane for the fuel proofness.