I have started to sand down the body on my 66 mustang. I am going right down to bare metal. Found several layers of paint from the original white, yellow primer, darker yellow, toupe green, white, red oxide primer and even found blue on one part.
But my questions is. What grade of sand paper do I finish with once I hit bare metal before I prime. 180 or 220?
Then after I prime I sand that out with 320?