Really thinking about repainting my car now that I found out my buddy just put in a paint booth at his shop. Said he'll show me how to apply it and paint it myself. I know how to prep, but applying is something new to me. I've been looking up paint and I have a few questions. 1) what is the difference in Acrylic, Urethane and acrylic-urethane? 2) How much paint would I need? Would a gallon do it or would I need more? 3) is all clearcoat pretty much the same or should I look for something specific?