Whatever you do,, don't try the powder coat idea. The stuff cures at like 375 degrees and you'll end up with a puddle of plastic in the driveway. hehehe Was a good thought though. I have taken small scratches out of my cladding with a heat gun. It will bring also bring up the oils in the plastic and make it shiney again, but you have to be reall careful or it will wind up looking awful.