- 1). Choose a deck finish made explicitly for composite decks. Most are oil finishes that penetrate the composite material and help restore the faded product. If you know the manufacturer of your composite decking material, check the official website to see if recommended finishes are listed.
- 2). Sweep the deck thoroughly. Clean with either a product approved for a composite deck or with a solution of warm water and soap. Use a stiff-bristle brush to remove any dirt, pollen, mold or mildew. Hose the cleaning solution off, and let the deck dry thoroughly. Depending on conditions, drying time may take up to 24 hours.
- 3). Cover any areas that you want to protect with plastic and painter's tape. Apply the deck finish according to the manufacturer's directions, using rollers and/or brushes. If you use a roller, you will still need a brush to treat corners and crevices. Pay extra attention to any screws or nails that have popped, and go over these with a brush. Brush or roll out any areas where excess finish has been applied or pooled, to avoid any shiny spots that may appear after drying.
- 4). Allow the first coat of finish to dry according to the manufacturer's recommended drying times. Do not attempt to apply a second coat if it is not recommended or before the first-coat drying time is complete. This would compromise the finished result.
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