I have been running into some trouble while spray painting my car. The roof of my 2000 Chevy Cavalier Z24 had some rust on it, so I sanded it down, put on primer, and used black Rustoleum for the colour.
I thoroughly sprayed the first coat, and sanded out the bumps with 600 grit sandpaper. I realized I made quite a few sandpaper cuts, so I sprayed another two coats and used 1000 grit paper wet-sand to smooth it out. After this coat, I noticed that the paint had gone a matt-grey colour (from gloss black). I figured I might have pressed too hard with the 1000 grit, and decided to do a final coat and wet-sand with 2000 grit. However, I still got the matt-grey discolouration. Mixed with the matt-grey, there are a few areas that have tiny gloss black spots and lines.
I am using an electric palm sandpaper with 800, 1000, and 2000 grit. The climate is slightly humid, and 22-25 degrees celsius. If anyone can help me out with this, that'd be great!!