so there's a few deep deep scratches/cracking/scrapes on the front and rear bumper of my GP, so i sanded them down smooth and then -- taped, primed, sprayed color(light coats, then one light heavy), then clear (light, light, heavy). i've been told that it's easy to simply use a polish to blend the paint into the old but so far absolutely no luck. it looks ok but yeah.. i know there's tricks to this but so far i haven't heard of anything. any suggestions??