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The primer flashes in 5-8 minutes between coats and can be topcoated in one hour. If you are going to let the primer sit for more than one hour and you are adding extra coats of primer, you will have to sand the primer with 600-grit paper. The shortcut is to not let it dry for more than one hour between primer coats. You don't have to sand before the topcoat is applied, it will just add scratch marks to the finish.