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.
Things you need
- Waterproofing paint additive
- 5-gallon bucket
- Wooden stir stick
Work in an environment above 10 degrees Celsius.
Clean the surface you are working on thoroughly before applying the paint.
Pour the latex paint in a five-gallon bucket.
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).
Stir the paint with a wooden stir stick for at least four full minutes. Apply the paint to your surface.
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