Panel Lines

I found a post once with a blue integra with white panel lines and someone commented on why they were there...im painting my car and they are there as well, except i can't seem to find the post anymore...can someone tell me why?

Ok I think I know why, you primed in White Yes?
well you put too much paint on in 1 go and it seems to do this. Spray lighter coats at first, then heavier after and you should not get this.

i primed in gray...is there anyway to fix it? or would i have to brush it?
btw its my first model ...hehehe...

get a blue gundam, or if u want black, get black.