Answer for Waterproof Existing Exterior Plaster

Elastomeric paint will form a film that prevents moisture penetration. Plus, it will allow any accumulated moisture out of the walls, a major plus for any old building. With a good brand it will last for many years and be easy to maintain.

A good brand that should be readily available in your area is Kelly-Moore. Their 1128 Elastomeric Coating is a great product, one that I have used many times. I believe Kelly-Moore offers a factory warranty.

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