RadonSeal - the First Choice
for Sealing and Waterproofing Concrete 
- RadonSeal™ Deep-Penetrating Concrete Sealer is the “do-it-once-and-forget-it!” sealer. No re-application needed.
- Your first choice among penetrating sealers: RadonSeal penetrates deeper and seals tighter – penetrates up to 4" into concrete and seals not only against water but also against water vapor and even radon gas.
- Your first choice before painting concrete: RadonSeal leaves the surface paintable. By protecting the paint against moisture and alkalis, the paint will several times longer.
- Your first choice before installing flooring: RadonSeal protects adhesives, flooring and tiles against “alkali attack.”
If the sealer waterproofs concrete, why is it called "Radon" Seal? Because it is much harder to seal the pores in concrete against the tiny atoms of radon gas. Water molecules are held back inside capillaries by the surface tension of liquid water. Until the pore gets wet, it takes lots of pressure or time to push through a "blob" of water. Meanwhile, gases ooze easily through the pores. RadonSeal was developed to provide a much tighter seal, in order to keep out not only liquid water but even gases like radon. What makes RadonSeal concrete sealer so unique?
- Permanent, no re-application required.
- Seals against water seepage and also water vapor and even radon gas.
- Backed by a limited 20-Year Money-Back Guarantee.
- Protects outdoor concrete against water from both sides, even under a high hydrostatic pressure.
- Neutralizes alkalis and lime, protects concrete.
- Stops efflorescence.
- Bonds and strengthens concrete.
- Reduces concrete cracking.
- Leaves concrete suitable for painting or tile adhesives.
- Waterborne, no chemical solvents, zero VOCs.
- Safe, non-toxic, nonflammable, non-carcinogenic, non-hazardous.
- Easy and safe spray-on application.
Makes concrete denser and stronger When concrete cures by the hydration of portland cement (reaction with water), it produces "free lime" (calcium hydroxide) as a by-product. RadonSeal chemically reacts with the free lime and forms a gel, which forcefully expands into capillaries (pores) and hardens as an insoluble silicate mineral (calcium silicate hydrate C-S-H). This is the same mineral produced by the hydration of cement, which bonds the concrete and gives it strength. It becomes a natural part of the concrete matrix - silicates are the primary binders of concrete. Silicate minerals are hard and chemically stable like, for example, quartz and granite. RadonSeal provides a permanent internal bond for the life of the concrete, which cannot deteriorate physically or chemically. RadonSeal binds concrete into a solid dense mass. The sealed concrete has a lower permeability, a higher compressive and flexural strength (up to 45%), and a harder surface (almost flint-hard). Similarly to concrete, the RadonSeal curing process takes time and it reaches full strength in 60 to 90 days. RadonSeal cannot seal all of the microscopic pores. Some are too small to allow the sealer in and this allows the concrete to still “breathe.” Protect concrete against the elements Concrete is not a rock - it breathes and it ages. Just like wood, it deteriorates in the presence of moisture, only slower, and needs a sealer. RadonSeal keeps out moisture and harmful chemicals. The freeze-thaw cycle, road salts, deicers, and chemicals disintegrate outdoor concrete by pitting, spalling, rebar corrosion, and cracking. Unlike other sealers, RadonSeal waterproofs driveways and outdoor concrete not only against surface water, but also against water coming up from below through the gravel bed. One of the most common problems is the damage resulting from the corrosion of steel embedded in concrete. Rust expands up to eight times in volume and the internal pressure causes cracking and spalling. Chlorine ions from road salts or in marine environments greatly speed up the disintegration of concrete. RadonSeal protects the concrete as well as embedded steel. It seals the concrete against water migration and de-icing salts, and makes it resistant to most chemicals. In addition, it encapsulates embedded steel, shielding it against chlorides and corrosion. And similarly, it protects the wire mesh under stucco. Protect concrete against efflorescence The concrete's interior remains much more alkaline than its surface (about 400 times) and moisture migration brings alkalis to the surface. Lime and alkalis attack even the concrete itself, slowly "eating away" the concrete from within. In regions with highly alkaline soils (e.g. Nevada), alkalis carried by water from the soil can "eat away" inches of a concrete slab. Water carries the dissolved alkalis to the surface and evaporates, leaving behind efflorescence (“white powder”), also called the “cancer of concrete.” Efflorescence in basement or on a slab is a telltale sign of capillary water seepage. This leaching enlarges the pores in concrete and doubles the permeability of older concrete, further speeding up its deterioration. RadonSeal solves the efflorescence problem by neutralizing the alkalis inside the concrete and by stopping moisture migration to the surface. Prevent the "alkali attack" All concretes contain "free lime" (calcium hydroxide), the by-product of the hydration of cement. The presence of moisture then creates a destructive alkaline solution, which attacks all paints, coatings, and adhesives by reacting with fatty acids ("saponification"). It can even disintegrate the floor covering. Newly poured concrete is very caustic with a pH value of 11 - 12 (the pH of flesh-eating lime is 12). Although the alkalinity of the surface gradually drops as it reacts with atmospheric carbon dioxide (carbonation), it takes months or years to fall below the pH level of 9 required by many flooring and paint manufacturers under their warranty conditions. RadonSeal neutralizes lime and alkalis, which greatly reduces the alkalinity of the surface and protects paints or floor coverings. Prep for covering concrete floors Covering a concrete floor inevitably traps water and vapor that is pushing up through the concrete, particularly when using impermeable plastic sheets, linoleum, VCT tiles, or dense carpet backing. The moisture gradually builds up and may eventually cause molds, mildew, and musty odors. The moisture with dissolved alkalis attacks adhesives and even carpeting and plastic tiles. This may cause “plasticizer breakdown,” which releases noxious fumes into indoor air and permeates the concrete, which either has to be replaced or sealed with RadonSeal and Ion-Bond Armor. RadonSeal neutralizes alkalis and prevents moisture from bringing up more alkalis from the concrete. Before covering a concrete floor, use RadonSeal to reduce the alkalinity (pH value) of the surface and to seal against capillary water seepage and vapor transmission. Prep for concrete painting Painting concrete without sealing it first is a waste of money! The paint or surface sealer will soon peel because of the “alkali attack,” efflorescence or negative side pressure of water or vapor. Some people then re-paint but the paint is not designed for a double layer, traps more water vapor and it all just speeds up the peeling of the mess. The right procedure is to remove the old paint first, but it is a hard job and the new paint will peel faster because the concrete got older and more porous. RadonSeal passes through the pores in the surface, leaving them open. As it reacts and expands deep inside the pores, RadonSeal purges contaminants, dirt, oil spills, and loose minerals for several days. It is powdery and can be easily brushed off. As it purges minerals from the concrete, RadonSeal opens up the pores similarly to light acid etching and improves paint adhesion. RadonSeal neutralizes alkalis inside the concrete and seals it against moisture migration and efflorescence. It protects and greatly extends the life of paints, surface sealers, and waterproofing coatings (about three-fold). Concrete repairs and patching RadonSeal also bonds and strengthens already deteriorated or seeping concrete. Before concrete resurfacing or patching, remove any loose, cracked, or soft concrete and seal the old concrete or mortar with RadonSeal. This will protect the "cold joint" with the new concrete against alkalis and separation. Let cure for at lest 5 days, brush off any purged minerals, and patch or re-surface. More information on RadonSeal
 Product Bulletin - Deep Penetrating Sealers
Material Safety Data Sheet (MSDS)
Any questions? Please contact us by e-mail,
telephone (203) 225-0366 or toll-free 1-800-472-0603
MADE IN USA
Products not sold through retail stores. Available exclusively from:
Radon Mitigation & Waterproofing Concrete Sealer Co.
Novion Inc., 18 L'Hermitage Drive, Shelton, CT 06484 USA
RadonSeal™ is a registered trademark. Copyright © 1998-2008. All rights reserved.
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