Hirshfield's Pro-wall 2000 PVA Drywall Primer is a very fast drying vinyl acrylic emulsion primer sealer. It is designed for interior use only and is very popular with painters because the prime coat and the finish coat may be applied in the same day. Its high alkali resistance makes it possible to use this primer over new Sheetrock. Pro-wall 2000 PVA drywall primer bridges hairline cracks and it will not raise the nap on wallboard or new tape joints that have been sanded. Because #1255 is economically priced, it does not have quite the hold out that our premium #1250 Drywall Primer has.