Zinsser® Cover Stain® Interior/Exterior Oil-Based Primer is designed to stick to any surface without sanding and can be used under and over oil and latex topcoats. This whole-house primer and sealer is a favorite with professionals, blocking stains, hiding dark colors, preventing tannin bleed, and penetrating exterior wood for a superior seal. Use it on ceilings, walls, doors, trim, cabinets, furniture, siding, fascia, soffits, foundations, railing, and more.