PRIMER WB is a water-based primer which imparts an aggressive, high tack finish on the treated substrate. It is specifically designed to facilitate tenacious adhesion of Interior/exterior water base primer is a superior quality, fast drying, water-based primer, sealer and stain blocker that provides excellent adhesion and a mildew resistant coating. It’s ideal for use in moisture prone areas and blocks out most stains caused by water, tannin, ink, pencil, felt marker and grease. For use on interior and exterior surfaces.