Agualente® PLUS Stain-blocking WB White Primer is a GREENGUARD certified, fast drying, easy sanding water borne white primer made with a very unique all acrylic polymer that has built in functionality to help prevent tannin / stain migration. Special polymers lock in water-soluble tannins to help prevent them from bleed through while also creating an ideal smooth basecoat for water borne pigmented topcoats.