- 1). Nail down any loose boards with three-inch galvanized nails. Pull out loose nails with pliers.
- 2). Spread deck cleaner over the surface of the deck. Let the solution penetrate the surface for 15 minutes. Scrub the deck with a stiff-bristled brush.
- 3). Rinse the deck with a garden hose to remove the cleaning solution. Allow the wood to dry.
- 4). Attach medium-grit sandpaper to an electric sander. Sand the entire deck, moving with the wood grain. Sand until the original surface of the deck is revealed and free of previous paint or varnish.
- 5). Switch the paper on the electric sander to fine-grit paper. Sand the deck again to smooth the wood and create a good foundation for stain. Vacuum the deck with a wet-dry vacuum to pick up the majority of the sanding dust. Wipe the wood with a damp cloth to remove unseen particles.
- 6). Stir the stain with a long stir stick. Fill a roller pan with the stain. Roll stain onto a six-foot by six-foot area of the deck along the wood grain. Wipe up excess stain with a clean towel. Repeat for all sections of the deck. Let the stain absorb into the wood. Apply a second coat of stain.
- 7). Pour the polyurethane into a paint pan. Roll a 1/4-inch nap roller through the topcoat and roll it onto the stained wood. Apply two to three thin, even coats of polyurethane. Allow each coat to dry before applying the next.
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