- Wash the fence with trisodium phosphate and water. Scrub dirt and stains, using a scrub brush. Clean tough stains with oxygenated bleach. You can also use a commercially prepared redwood deck and fence wash.
- Allow the wood to dry completely. Drying times vary, depending on temperature and humidity.
- Lay a tarp over nearby plants, bushes, decks and patios to protect them from splashes, drips and overspray.
- Apply a coat of mildew-resistant, UV-blocking wood sealer to the fence. Look for a waterproofing sealer that is specific to redwood. Apply the sealer with a wide paintbrush, paint roller or painter sprayer. If you are using a paintbrush, follow the grain and paint in one direction.
- Allow the fence to dry for 48 to 72 hours, depending on the weather, before touching it.
Things You Will Need
- Trisodium phosphate
- Scrub brush
- Oxygenated bleach
- Mildew-resistant, UV-blocking, wood water sealer
- Paintbrush, roller or paint sprayer
- Reapply sealer every year to keep your redwood fence looking new. If you live in an area with severe changes in weather, applying the sealer twice yearly.
- Wear a dust mask, gloves and safety glasses when you're waterproofing a redwood fence.