That's what we call "dry" paint... When it's supposed to be glossy but came out matte... It means you did not get enough material on the areas. Wet-sand with a block and 600 and reshoot. Other than that, you could try wet-blocking with 1500 and buffing if it's the third coat and the other two were fine, but you may end up with a wavy body job (where the reflection distorts because the panel is not straight)
Also, how much of the car are you doing at a time? I'm guessing you're trying to shoot the whole thing (fenders to quarters) at a time.... Pull the panels and shoot each panel, then the shell. That way, you have much less area to cover at a time.
The two extremes are runs and dry spots; If you're getting both, then I think the culprit would be your technique... Try to keep a rhythm, and keep the paint gun squared-off with the panel. Try to be like the robot arm that paints cars on the assembly line (straight-on with the panel at all times)... When you flick your wrist or curve the tip away from the panel, you speed up the rate of the material hitting the panel and this will result in dry spots. Also, take a trash can or piece of cardboard or scrap or -something- in the booth with you to fine-tune your pattern, material, and pressure before spraying. Also, don't forget to overlap... Also also, I'd turn the material down just a hair if you're getting runs...
I usually only overlap about 30% at the most, but I also shotgun the paint on with the material knob wide open, and move at the speed of sound... Working in a huge, busy, production-oriented body shop for a few years teaches you how to kick-out a glassy paintjob in no time flat. ;)
- CK
