I used "Al's" on the plastic fenders and it has worked great. I spent ALOT of time on the prep work scuffing them up, and it hasn't peeled or tried to come off at all. I'll try and post some pics. Well worth the effort.
I went to Al's Liner website under fax,there was a question on what it can be used on and it said everything but hard plastic.
Yea, I read the same thing. I gave it a shot anyway and it hasn't tried to peel or come off. Ive had it on for over a year. Now I completley disassembled the gators fenders and used sandpaper and a wheel to scuff up and mar them so the spray on would have something to adhere to instead of the smooth plastic. I'll try and get some pics together of the before and after.
Rustoleum makes a really nice spray-can bed liner that sets up really hard. Autozone carries it. LOOK AT THE UPC CODE - THE LAST NUMBER ON IT IS A "7".
They have 2 different formulas of this suff, but get thwe one with a 7 at the last of the UPC code!!!