Crystal Seal - Waterproofing Africa, We Reign When It Pours

why this product apposed to A silicon base?

CRYSTAL-SEAL is an invisible, deep penetrating, weather resistant, water and dirt repellent product which seals brick, stone, concrete and mortar surfaces against penetrating rain and water from garden irrigation systems and rain. On any porous surfaces such as pre-cast concrete walls or asbestos / Nu-Tech sheeting, CRYSTAL-SEAL will prevent algae growth and subsequent discoloration.

This is the story....

When NASA needed a product to clean the ceramic tiles from the underside of space shuttle after re-entry, they could not find a product on the industrial markets that would clean deep as the the engineers requested. The problem was that the dirt burnt into the ceramic tile at over 2000 Degrees. The idea was to create a product in the lab that would penetrate through micro fine molecules, then adding a cleaning detergent within that would dig out the dirt from deep and bring it to the surface to be washed.
Once the formula was perfected, they realized that if you can get in so deep, (micro particle level) why not remove the cleaning agent and replace it with a crystal molecular  waterproofing agent…..
Done…now the formula would allow the waterproofing crystal molecule to be deposited deep within substrates allowing the material to be waterproofed, and this is totally UV Stable, as UV will only attack the surface of an item