Zinsser 2300 Problem Surface Sealer, 5 gal, Clear Use on porous areas such as ceilings, interior walls and related surfaces prior to texturing, wallcovering or painting Water-based, low odor formula applies with a milky-blue/white tint for proper coverage and dries Clear Covers up to 2250 sq ft and dries to the touch within an hour Unique coating seals adhesive residue and protects drywall from tearing, blistering and more Creates a Clear, hard, flat finish ready for topcoat