What is the best sealer for a deck?

The best sealer for a deck is one that can protect it against the elements, repel water and show off your deck’s natural beauty and grain. Water-based sealers are common among deck owners and more environmentally friendly. Oil-based sealers tend to be more durable and last longer. 

Clear deck sealers bring out your wood’s grain but don’t block UV rays, making the best choice for a deck sealer is one that inhibits UV through chemicals and colors. The best balance usually comes from a semi-transparent sealer.