Quoted from tezting:Is it even possible to lay down a so perfect flat coat as the last coat that this step is not needed?
no. No matter how smooth that final layer is. There is always some random crap that happens to get in the clear. Either particals of dried clear, or random shit floating around or something. Obviously the less crap that gets in that final layer, the less sanding with 3000 grit you have to do, but there is always some to some degree and you always have to buff with buffing compound. That's why, just clearcoating , costs so much for me to do ($350 for level 1 with minor black line work). Just basic clearcoating for NOS, or repro, that needs leveling and 3-5 layers of clear, takes a crapload of time.
First there is playfield prep. Insert edging detail, then first layer of clear. Then block sanding, then scuffing, then 2nd layer. block sand, scuffing, 3rd layer (rare cases this is final), block sand, scuff, 4th layer, then 3000 grit spots where crap fell in. Then about an hour of buffing and glazing layer.