I haven't had any experiance with a gas/oil mix damaging gelcoats. I have a powerboat that has an imboard gas tank and I have had gas spill on the outside when i overfill it on ocasion (sp) while it is trailered. I have not seen any sign of damage yet to the gelcoat from this.

Also, since a good many of the power boats out on the water are also fiberglass, one would think that gas and oil would not hurt the gelcoat.

I could be wrong since I dont have any science to back me up on this though.

The Skier