on mine, I used primer, color and clear, all same brand. time frame between color coats within what the manufacturer says (long enough to flash). clear coats was a minimum of 24 hrs. lots of sanding before paint (as I said, took the plastic parts down to bare plastic).
Note: when mine first did this, I redid all steps (including taking it back down to bare plastic), and redid the primer, sand, primer, sand primer, paint, paint, sand, paint, paint, let dry good, then clear, clear, sand, clear, sand, clear. same exact result on that cover.
well, the exact order and number of paint/sand and such may not have been what I posted, but it was similar to that.