How should I prep for a color change over existing good paint?

Dang dude....that looks good! Shines good, so you weren't afraid to lay the clear to it on the 2nd coat. When you give a progress report after you get the door and fender on, maybe just mumble a little bit until the very end word. "I'm mmfd bblrzt door nnaqrt fndrz bwc hung."

:rofl: