So, my wheelwells are pretty heavily modified to remove the mounting bosses and smooth them as much as possible, but that doesn't change the paint I used during the process.
I've really become a fan of SEM products since I have to use aerosols. Their sh*t ain't cheap, but the quality is top notch! During the bodywork phase I used their high build primer which block sands really nice.
For the final paint I actually used a basecoat clearcoat to be more durable. They have a line called "factory pack" which is designed for production type shops that need to do touchups or cut ins, but after talking to their engineer I felt comfortable to use it for the wheelwells. The base is GM black, and the clear is their 1K high solids semi gloss clear. I laid down 3 coats of base, 3 coats of clear and just let it cure all the way!!!!
Here are a few pics, I will post more if needed, just let me know.