Do it right the first time, my friend got parts of his white car done by maaco, his spoiler and then part of the trunk where the old holes were, the paint is more yellow then the rest of the car, its very rough, no shine at all, dont even think they used clear coat.

I suggest you give a good wash, using dawn in your water bucket, then use a claybar or body scrub to clean the paint real good. Follow up with 3m Swirl Remover, then follow with a polish, like Meguiars Show Car Glaze or 3m Handglaze, then put on a good coat of wax. that should get it looking good again and keep the paint in good shape for a while longer