Seals wood Blocks stains including from smoking and fire damage Blocks odours Adheres to wood, drywall, plaster, masonry, metal, PVC, as well as glossy paints and enamels, or even glass and ceramic tile. Can be used both under, and over acrylic, and alkyd based coatings. 1 Gallon can Coverage: 400-500sq ft/gallon $60+taxes. In store purchase only, unless on account.