LevelQuik Advanced Acrylic Primer/Sealer prepares surfaces for the application of LevelQuik or LevelLite Self-Leveling Underlayments. It seals porous and non-porous surfaces and improves the bond of underlayments. Suitable substrates include absorbent and non-absorbent concrete, lightweight concrete, cement terrazzo, exterior grade plywood, OSB, cutback adhesive residue, resilient flooring. Do not bond directly to hardwood, Luan plywood, particle board, parquet, cushion or sponge-back vinyl flooring, metal, fiberglass or plastic. Do not use as a wear surface.