Plaster is an important material used in home repair. Like all things, waterproofing technology undergoes many changes. The University of Southern California recommends a waterproofing solution that it developed, organopolysiloxane waterproofing treatment. It has low toxicity and is simple to use. By choosing to waterproof with organopolysiloxane, you stay up-to-date with modern waterproofing technology. Application of organopolysiloxane waterproofs plaster as well as other porous surfaces.
Brush the organopolysiloxane waterproofing treatment directly on the plaster. Cover the plaster completely with organopolysiloxane solution.
Soak the solution into the plaster for one hour. Porous surfaces like plaster need more time to absorb waterproofing solutions.
Blow dry the organopolysiloxane solution using the highest heat setting. Hold the blow dryer 6 to 10 inches from the surface of the plaster for 20 minutes. Heat activates the waterproofing properties. The plaster is completely dry when the surface is smooth to the touch.