To Stain or Add Water-Repellent For a new deck built with pressure-treated lumber, let the decking dry out for about two to four weeks, depending on weather conditions. Test the lumber for dryness by sprinkling water on the surface. If it soaks in readily, the surface is ready to receive a finish. Untreated lumber should be finished as soon as it is dry to the touch. If you wait too long, the surface of the wood will have begun to degrade already.
Let the deck dry completely before you apply stain. If you've just finished cleaning your deck, wait two or three days before you apply a stain. Give a new deck made from pressure-treated lumber several days to acclimate before you stain. Even if you touch the wood and it feels dry, you can't trust that. If you use a stain when the deck is still wet, the oil won't penetrate the wood, and the stain will sit on the surface instead of seeping in. When you stain, cover as much of the wood as you can, including the ends.
Water repellents are transparent, protecting the wood from water damage without altering its natural coloration. Water repellents with an added preservative combat mildew. Ultraviolet (UV) stabilizers are additives used in some clear finishes that offer some protection from sun damage. Semitransparent stains are more durable than water repellents. The pigments used in the stain protect better against sun damage. Penetrating finishes can include an insecticide. Look for products specifically made for use on decks.
More on when to stain Information courtesy Better Homes & Gardens®
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