got an old tank with that ugly plastic wood trim? krylon fusion is your answer.
i had a tank that had wood trim lookin stuff that got scraped up and i just sanded it smooth with a finer grit sanding pad.
then i just taped it off and used satin black krylon fusion for plastic. worked great.
just thought i would let you all know if you wanted to revamp your tank trim. you could even color it if you wanted. but from what i can tell, the color selection is pretty basic.
picked it up at walmart for about 5 bucks. lowe's doesn't carry krylon, they carry valspar. i've used valspar's plastic paint before, and i didn't like it as much. and the spray nozzle on the krylon is really nice. adjustable spray pattern and i lot better activation method than the old white cap.
let me know if you have any questions.