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Yes, you must thoroughly clean your deck before staining. If you don't, dirt, debris, grease, and mildew can get trapped between the wood and the new stain. This not only looks unsightly but also prevents the stain from penetrating the wood properly, reducing its ability to protect the deck from weather and UV rays. As a result, the stain won't last as long or look as good. Any existing mold or mildew left untreated can continue to grow beneath the new stain, potentially leading to wood rot and structural damage. Always wait at least 48 hours after cleaning for the wood to dry completely before applying stain.

The plastic in composite decking boards protects them enough that you do not need to paint them to prevent warping. In fact, painting composite decking voids the warranty of some manufacturers. Painting can also increase maintenance on the deck, as you must paint regularly to keep it looking its best.

Yes, it is generally a very good idea to seal your deck after pressure washing. Power washing removes not only dirt and debris but also a thin layer of wood, leaving the surface exposed and more susceptible to weathering. Sealing is almost always needed after this process. After a general cleaning, sealing isn't automatically necessary if the existing sealant is still intact. You can test the surface by placing a few drops of water on it. If the water beads up, the sealant is working. If it soaks into the wood, it's time to apply a new sealant. If it has been a few years, it's wise to remove the old sealant, wash the deck, and reseal for maximum protection.

The number of coats you need to apply when whitewashing a surface depends on how opaque you want the final product to be. If you're going for a transparent, barely there look, a single coat or two may suffice. For fuller coverage, you'll want to use multiple coats. Another option is to use a less diluted paint to get a thicker coverage.