I shot 4 heavy coats of universal clear in December and ended up with some dirt, two heavy sags and numerous small runs. I have blocked all of them down and I'm just finishing with cutting with 1500. My plan had beed to cut down to 3000 then buff, but with these issues, even thou I haven't broken through, I may be close to it in those areas. I'm afraid, I may break through during buffing or end up with not enough UV protection. Can I re coat with clear now after 6 months?