What is the best deck sealer?
On One Hand: Sealing a Deck Against MoistureIf the primary purpose of sealing a deck is to preserve its condition and natural wood grain look, a clear water-based sealer is likely the best option. Water-based sealers penetrate into the wood better than synthetic-based sealers. You must reapply these sealers more frequently than others as they usually contain minimal ultraviolet (UV) protection and will allow the wood to turn gray.On the Other: Sealing a Deck Against DeteriorationTo seal decks against the elements, many prefer a semi-transparent or solid toned synthetic resin-based sealer. These sealers provide better protection against UV rays while still providing a shield against moisture.
