Save time and materials when finishing porous woods by starting with Rust-Oleum® Varathane® Sanding Sealer. This high-building solution dries clear and seals the wood to create a surface that can be easily sanded. Contributes to an ultra-smooth final finish.

Does varathane make wood waterproof?

No, polyurethane does not make hardwood waterproof, but it does make wood water resistant. … Polyurethane is a thin layer and is discontinuous (with minor holes). Even small scratches and abrasions will allow water to penetrate the surface if you only have 1 coat.

Does polyurethane seal wood?

METHOD 2: Use sealants for best protection Polyurethane, varnish, and lacquer are tried-and-true sealants with excellent waterproofing properties. They’re either brushed or sprayed onto clean, sanded wood and then allowed to dry completely, prior to the piece being lightly re-sanded and recoated.