How to Seal Deck Paint

How you seal the paint on a deck varies based on what materials were used in its construction.

Painted wood decks are sealed with outdoor paint sealants.Painted wood decks are sealed with outdoor paint sealants.
One of the most popular materials for deck construction is wood. Although many homeowners prefer a natural look and stain the deck instead of painting it, some prefer to give it a different color. Seal the deck with a sealant specifically designed for outside paint.

Sweep up dirt and debris on the deck with a broom. Hammer any nails that may be sticking up. Check to see if any areas need to be repainted.

Wipe off the deck with wet rags. Power wash the deck if the paint is covered with severe grime and dirt. Allow the deck to dry for 48 hours. Check to make sure it won't rain for the next two days and the temperature will be over 40 degrees Fahrenheit.

Put on rubber gloves, a painter's mask and eye protection. Paint sealants contain noxious fumes.

Pour an outside wood paint sealant into a sprayer. These products are available at home improvement and hardware stores.

Spray the deck with long even sweeps. Check to make sure the sealant gets under any railings on the deck.

Inspect the deck to see if there are any bumps from the sealant. Sand the surface lightly with a fine sandpaper that is 220 grit or more. Sweep up any dust and debris from the sanding. Wipe the area where you sanded with a damp rag.

Apply at least one more coat of sealant.

Wait 48 hours before using the deck.

Things You Will Need

  • Broom
  • Hammer
  • Rags
  • Rubber gloves
  • Painter's mask
  • Eye protection
  • Outdoor wood paint sealant
  • Paint sprayer
  • Fine grit sandpaper


  • Many outside paints already have their own sealant.


  • Some deck manufacturers don't guarantee their products when they are applied over paint. Make sure the sealant is suitable for outdoors.

About the Author

John Smith is a writer with over 30 years experience. He has worked at a newspaper, various magazines and websites, and he has interests in a wide range of subjects including sports, politics and entertainment. Smith earned a bachelor's degree in history from the College of New Jersey.