How to Waterproof Plywood

Written by kelly berry
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How to Waterproof Plywood
Plywood should be properly sealed if it is going to be outdoors. (Karl Weatherly/Digital Vision/Getty Images)

If plywood is to be exposed to the elements, waterproofing is a neccessity. It is a material very vulnerable to nature, especially water, and if left outside, plywood will only survive with a good coat of waterproofing. Applying a waterproof top coat is easy and affordable, and can last from four to six years if applied properly.

Skill level:

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Things you need

  • Waterproofing
  • Brush or roller
  • Gloves (optional)
  • Paint tray
  • Stirring stick

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  1. 1

    Mix a can of sealant by shaking the can vigorously. Open the can and stir the contents with a stirring stick.

  2. 2

    Pour some sealant in a painting tray and generously dip a brush or roller in the sealant. Apply the sealant in even strokes, covering the plywood with a thin, uniform layer. Let it dry for 35 to 45 minutes.

  3. 3

    Apply a second layer in the same manner. Some sealants must be applied multiple times; consult the sealant's can for brand-specific instructions.

Tips and warnings

  • Many brands and types of waterproof sealant exist. Consult a paint store for an overview of your options. You can choose a sealant based on price, quality, durability or colour.
  • The wood surface must be dry when waterproofing is applied.

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