well wet sanding tends to be a lot easier as the paper doest die as easy, as well wet sanding doesnt cause uneven deep scratches and has a more even roughness. just make sure you get wet sand paper cuz if you get dry paper and then use it as wet it'll fall apart
if you still wanted to use plastidip on them you can paint over plasti dip and still peel it off the same way. if you do go this route make sure the dip is fully dry before painting over it. i just love plasti dip so ive used it a decent amount (eye lids, badges, ect.)
whatever you go with post up some final pics cus im thinking of painting my g37s rims and i dont know if i want gold, bronze, or black (im leaning to gold)