The gas will dry out the rubber pretty easily, definately dont use it on your tires.
Also, Black Sand is a great prep for dry tracks, or dusty tracks, or if you just want to build bite in your tires. I like this prep and use alot of it because it wont drop the duro on your tires and it is very hard to beat when used at the right time. It works best with 10 days of cure time, but the longer you let it cure, the better the tires will be. You can also mix black sand, goat pee and acrysol using 1/3 of each and it makes for a great PRW for moist, wet, dry, dusty, just about any kind tracks when you need alot of bite, mainly low bite tracks.