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porous cement coating

Dear colleagues: I need help finding a proper coating for porous cement that will allow some evaporation but will not let rain go through. This is important for places where freezing occurs. Thanks

Sylvine Valentini
- Philadelphia, Pennsylvania
2000

Do you want a water based coating? Also, is this an outdoor application. Some acrylics might work.

Tim Cornelius
- Texarkana, Arkansas USA
2000

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