Here at Stone Technologies Corp. we are frequently contacted by people who either have a flat roof or a balcony over an inhabited area that leaks water when it rains into the structure below.
We fix this problem by applying two coats of Concrete Sealer X-3 which is an impregnating silicone polymer that makes the concrete surface water repellant after a 24 hour cure time.
Two coats of Concrete Sealer X-3 are applied within 2 to 4 hours of each other. The sealer is invisible when it has dried and does not make the surface slippery.