How to Waterproof a Wood Top of a Sink Vanity


However, the nature of the bathroom climate, which includes regular variations in humidity and temperature, can wreak havoc on wood. A wood countertop in a bathroom provides warmth and texture to the space, but wood may be damaged by the frequent fluctuations in humidity and temperature. Tung oil may be used to give the wood a polish that will make it more resistant to these obstacles. Tung oil has been used for generations to provide a rich finish that is waterproof and resistant to things like nail paint remover and toothpaste, making it ideal for use in the bathroom, as stated by Woodwork Details.

  1. Sand the surface of the wood using sandpaper with a fine grain, beginning with 180 grit and increasing to 220 grit as necessary, until the surface is smooth and free of any flaws, paint, or other finishes. Dust should be removed from the surface of the wood using a vacuum cleaner, and then the surface should be cleaned using a damp cloth. Let the wood dry out fully before using it.

  2. According to the instructions provided by Wood Improve, a layer of oil should be applied to the surface of the wood using a lint-free cloth, such as an old cotton T-shirt. Pour the oil onto the cloth, then rub the surface of the wood in the direction of the grain until the entire surface is coated. Make sure to remove any puddles that may have formed along the way. After allowing the oil to soak in for half an hour, wipe the surface off with a fresh towel.

  3. After the oil has been allowed to dry for twenty-four hours after the first application, rub the surface of the wood with extra-fine steel wool. You should apply another coat of oil, wipe it clean after 30 minutes, and then give it another 24 hours to dry after that.

  4. Repeat the process of sanding the wood’s surface using steel wool that is very fine. After applying the last layer of oil, wipe the surface clean after half an hour and then let it a full day to dry. Sand the surface with steel wool once more if you so choose, but keep in mind that doing so is not required if the wood seems to be clean and smooth.

    Things You Will Need

    • Fine-grit andpaper

    • Vacuum

    • Towel

    • Cloths

    • Tung oil

    • Steel wool


    When applying the first two coats of tung oil, combine it with a solvent such as turpentine or a citrus-based thinner at a ratio of 1 to 1. This will allow the oil to penetrate the wood more deeply. When applying the last layer, make sure to use full-strength oil.


    If you brush the wood with steel wool, you should create a fine powder as a byproduct. If this does not occur, then you will need to let the oil dry for another 24 hours.

    Because it takes weeks for tung oil to properly cure, the wood has to be kept dry and away from any chemicals for a few weeks after it has been treated with tung oil.