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That will depend on the particular clear that you used and the temperature during spraying and cure. There are a lot of urethanes that you need to get on the next day. I've just switched to a high solids clear that buffs as good 2 weeks later as it does the next day. So it's sort of an open question.
My neighbor painted his truck and waited a week to sand and buff. He said he did this on purpose because it would be a lot harder to sand and buffer through the clear. I dont know too much but thats what he said.
What's the proper amount of curing time required on a BC/CC finish before you can wet sand and buff for final finish? Days? Hours?
One of the problems with getting on it too soon is that it will cure out later and sink into the sand scratches, for best results we cut and buff for driving appearance and then do it again at least 1 month (6 is better) later after the paint has time to cure...although it it easier to sand and buff sooner, the depth will not be there until full cure IMHO
most clears if they are baked can be wetsanded within 12 hours. if you cant bake it ( 400* plus) then wait atleast a week for all the solvents to come out ofthe paint, or you'll just be cutting it and it'll buff out, but it'll dye back down in a couple days.