How to Waterproof Already Painted Wood
Painted wood surfaces, such as siding, decks or patio furniture, need a barrier from moisture. The optimal method is by adding a layer of moisture-resistant primer to the wood before applying a finishing layer of paint. The experts at Home Improvement Super Pages state, "The problem is that wood is a notoriously thirsty substance, and it is easy for water to get absorbed into the grain itself." For wood that's already painted, adding a layer of wood sealant is the easiest method for waterproofing. Larger projects can take a couple of days to complete, but the added protection is necessary to combat moisture damage.
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Things You'll Need
- Liquid detergent
- Water
- Bucket
- Cleaning brush
- Garden hose
- Polyurethane or silicone-based wood sealant
- Paint sprayer
- Safety glasses
Instructions
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1
Mix 1/4 cup of liquid detergent with 1 gallon of water in a bucket. Scrub the painted wood surface with a cleaning brush dipped in the soapy water.
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2
Rinse with clear water using a garden hose. Allow the surface to dry for two to three hours.
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3
Apply an even layer of silicone-based or polyurethane wood sealant using a paint sprayer. These products are available at all home improvement centers. Give the sealant product 24 hours to completely dry.
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Tips & Warnings
For complete moisture protection, it's best to strip the paint, and add a primer coat. Clear coat sealants won't last as long without a layer of primer coat beneath.
Wear safety glasses when using chemicals, such as sealants.
Work in a well-ventilated area to minimize the fumes.
