Trojan Masonry Sealer penetrating sealer fills the voids and coats the interior particles of the matrix to waterproof and reduce vapor transmission in concrete and masonry. The product works on sidewalks, driveways, floors, pavers, and other surfaces. In addition, the sealer is suitable for historic preservation projects by strengthening the substrate and creating a flat finish, not a sheen. Eco-Wares. 866-874-8070.