Do I need a sealer?, Some paint help please Options

[jonferns]

Hey guys, so I primed my car about a month ago, using Dupont 2K urethane primer. I've been reading some paint threads and it seems like some use a sealer before paint, is this necessary? Do I need to sand the current primer before sealer? Also, im deciding between using a single stage acrylic or going 2-stage, for durability and cost-effectiveness, so any advice would be greatly appreciated. Thanks

[charliew]

Good shops use a sealer to hopefully give another layer to prevent any thing from showing up under the primer later and to give a even surface of the same color to make the top coat color to be even overall. Yes the primer must be scuffed so the next coat will adhear. Only with nonsanding primers and only usually within about 12-24 hours will you not need to scuff the existing primer. You can go online and get the tech sheets for any good brand paint.