Deck-O-Shield Plus Natural Stone and Salt Sealer. Premium-grade, ready-to-use, water-based sealer formulated for use on natural stone. Deck-O-Shield Plus is formulated specifically to seal porous surfaces and is ideal to use on pool copings and decks protecting them from salt penetration. It can be used on all porous surfaces such as natural stone, tile, concrete, pavers, and grout. Deck-O-Shield Plus provides a solution to spalling and pitting of porous stone and concrete surfaces caused by salt penetration as well as spalling caused by freeze-thaw cycles. Deck-O-Shield Plus provides a matte finish to the surface.