I did 7 coats I only got few tiny bubbles. I used regular mineral spirts on mine and the paint rock hard after just a few days. The black is hard to do but after testing I figured out that after you do the sixth coat wet sand lightly with 600 grit and do one more singlecoat then go straight to 2000 grit. Because if you don't and wet sand too much and into the next layer of paint it will leave little shiny rings in the paint that you can't buff out. I polished it with the turtle wax polish with the buffer then hand buffed with meguiars mirrior gaze #7. I included another pic.