I am trying this painting method on my car hood, which I have removed from the car and am painting in my garage. (I want to get the technique right before I start on the rest of the car.) Anyway, I sanded off the old paint down to the metal then applied a layer of rustoleum primer spray paint. I then applied a layer of rustoleum enamel (exactly what you used except black) mixed 50/50 with mineral spirits. The first coat went on beautifully, I sanded it 24 hours later and prepped it for the next coat. When I applied the 2nd coat however, I guess the mineral spirits began reacting with the first coat and started removing the paint. What is the cause of this? Is my mixture too thin? Not mixed well enough? Did you have any problems with your extra coats removing previous coats? I would greatly appreciate any help anybody could give me. I'll upload pictures if needed.