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Water Sealants
Professional® Water Sealant is a unique penetrating water repellent which is manufactured using room temperature vulcanizing (RTV) silicone rubber as the active ingredient. This high performance “gun grade” silicone rubber was developed for use by the military during World War II to meet applications requiring superior durability and resistance to extreme temperatures. It’s use provides all formulations of Professional® Water Sealant with performance characteristics that far exceed those of other penetrating water repellent technologies.
Performance Characteristics
- Penetrates below the surface to create an invisible shield against water
- Breathable for moisture vapor transmission that is critical to maintaining masonry
- Transparent and dries clear and flat with no sheen on the surface
- Withstands wind driven rain of 90+ mph (60+ mph on block)
- Fills pores with Silicone Rubber, not just changing the angle of pores
- Bridges hairline cracks by elongating up to 400%
- Long lasting and doesn't deteriorate in UV light, salt, chlorine, acid, or the elements
- 5/10 year performance warranty, not just a manufacturers defect warranty
Professional Water Sealant protects against
 | Freeze-thaw Damage Cracking from water absorbing into masonry, freezing, and expanding. |
 | Spalling Chipping and flaking from water absorbing into masonry, freezing, and expanding. |
 | Efflorescence Water migrating through masonry and dissolving salts that deposit on the surface and weaken masonry. |
 | Lime Run Water migrating through masonry and dissolving calcium hydroxide that deposits on the surface and weakens masonry. |
 | Mold Mold eats away at masonry as it grows in damp areas with a food source such as dirt. |
A Superior Alternative to Silanes and Siloxanes
It may be hard to believe, but Professional Water Sealant is unique among water repellents. We are routinely called on to protect highly porous substrates, such as split face and fluted block, after other products have failed. Our RTV Silicone Rubber product penetrates below the surface of masonry and cures clear, flat, and breathable. As a long-chain polymer, a great benefit of RTV Silicone Rubber is that it can elongate up to 400%, which means our product fills pores and hairline cracks. Silane and Siloxanes aren't long-chain polymers and don't elongate. In addition, RTV Silicone is more highly refined than Silanes and Siloxanes and has had the organic matter removed from the material. Organic matter deteriorates in UV light and the elements. Professional Water Sealant does not deteriorate in UV light, salt, chlorine, acid, or the elements and doesn't need reapplication in a few years, like Silane and Siloxane products. View the chart to see how we compare to Silanes and Siloxanes.
| Features | Silane/Siloxane |  |
|---|---|---|
| Penetrating | Yes | Yes |
| Breathable | Yes | Yes |
| Cures clear and flat | Yes | Yes |
| VOC compliant | Yes | Yes |
| Fills pores in masonry | Not completely | Yes |
| Bridges hairline cracks | No | Yes |
| Protects against wind driven rain | Less effective | Yes |
| Protects highly porous materials | Less effective | Yes |
| Can double as an anti-graffitiant | No | Yes |
| Very long lasting | Not as long lasting | Yes |
What is Silicone Rubber?
Silicone Rubber is derived from inorganic silica (sand). Silicones were developed for commercial use during World War II to meet military applications requiring extreme temperature resistance. Over the years, numerous advances have been made, improving tensile strength, elongation, tear resistance, etc. Therefore, in addition to its broad temperature resistant properties, silicone rubber now possesses physical values superior to a number of other synthetic polymers.
Silicone functions reliably under many conditions that cause organic elastomers to fail or deteriorate prematurely. Chemically, silicones are quite different from other rubber-like materials and it is this difference that gives silicone its unique combination of properties. Organic polymers are made up of a backbone of carbon to carbon atoms. These are deteriorated easily when subjected to elevated temperatures and the effects of ozone.
By contrast, silicone rubber is made up of a backbone of silicone and oxygen atoms. This unique linkage is the same as that found in other high temperature materials such as quartz, glass, etc. As a result, silicone rubber provides outstanding high and low temperature resistant properties as well as general inertness toward many deteriorating effects such as ozone, corona, weathering, ultra violet, acids, bases, salts, oils, fuels, fluids, food products. Etc.
Available in Three Strengths
Professional Products of Kansas, Inc. manufactures three strengths of Professional® Water Sealant that provide superior protection for all types of porous, above-grade building materials.
| PWS-5 | PWS-8 | PWS-15 |
| Hard fired brick, poured concrete, most horizontal surfaces | Very porous brick and concrete, stucco, sandstone and limestone | Split face, fluted, expanded shale and other extremely porous block |