I am no expert on ths subject,
but straight from the thread:
Hope it helps
"It is crucial that you have a good grasp of the “covering” technique for laying color. Begin by doing the “wash prep” followed by the ”tack prep”. Once you are ready and feeling confident with your “covering” technique, begin your “dust coat” of the color. Allow that 10 minutes to tack then go with the “covering” method. Just as above do the “covering” method by doing four full passes, wait 15 minutes, repeat, and repeat again. This again should be twelve coats, give this 24 hours in the booth. After the set time, go straight into another “dust” coat followed by the same 12 coat “covering” process. Curing time, allow the object at least 48 hours to cure before continuing. After curing, DA wet sand the object lightly with the 1200 grit paper, again stay away from edges, they will have to be done by hand. Make sure you start with clean paper. Sand until orange peel finish is removed all the way down to smooth color, but not through to primer! Once sanded, complete a “wash prep” followed by“tack prep”. DO NOT “dust coat” this time, just lay two passes of “covering” coats and wait 15 minutes then lay two “covering” coats of clear paint. Allow this to cure for 48 hours. Now you’re ready to clear."
Looks like he only sands once....