Well., In the end You did that right, congrats, I would have let that dry longer between coats, (or used infrared chicken lights) Because that much product tends to shrink and cure especially with subsequent coats like that. But I get why you that, it, that's what the can says.... Sega did that black matte thing, with screened vinyl stuck over the top of that. but don't believe they used any primer or sealer, (fast clean out the door) and like discussed earlier peeling was a problem, and when it did let go there was no color underneath.