How to Waterproof Waterbased Paint

Written by ryan lawrence
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How to Waterproof Waterbased Paint
You can protect your paint from moisture by mixing in a waterproofing paint additive. (rain image by tomash from

There are generally two ways to waterproof water-based paint. You can brush on a coat of simple clear waterproofing sealer, or you can stir in a paint additive before you begin the application process. If you choose to brush on a sealer, the process is as simple as dipping and brushing. However, if you want to go the other route, there are a few things you need to know before you get started.

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Things you need

  • Waterproofing paint additive
  • 5-gallon bucket
  • Wooden stir stick

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  1. 1

    Work in an environment above 10 degrees Celsius.

  2. 2

    Clean the surface you are working on thoroughly before applying the paint.

  3. 3

    Pour the latex paint in a five-gallon bucket.

  4. 4

    Pour in the waterproofing paint additive in a 1-to-4 ratio (the additive should represent 20 per cent of the total paint volume, or 1 gallon of additive to four gallons of paint).

  5. 5

    Stir the paint with a wooden stir stick for at least four full minutes. Apply the paint to your surface.

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