If it were me I would get the primer as smooth as possible before I sprayed the undercoat. Then if after the undercoat's dry, if it's not gonna be smooth enough, I'd wetsand it with like a 2000 or 2500 grit paper and hit it again with basecoat. Then it should be ready to go for the color.
....After you clean up the spoiler a bit more on the back end of the car....NICE SO FAR MAN!
I agree with this too. The rear end could use a little more attention I think.
Edit: I don't mean to take away from the work you have already done. You have done a wonderful job and have done a lot of work. It's looking great so far.
Edited by BluePopsicle, 19 October 2012 - 03:23 AM.