Sodium silicate sealers penetrate into concrete surfaces and chemically react with the free lime and calcium present to form Calcium Silicate Hydrate (CSH) within the pores. The CSH formed is microscopic and can only be seen under a microscope. The CSH crystals form within the pores and will increase the density, and therefore surface strength, of concrete surfaces. A few facts about sodium silicate sealers:

1. The size of the CSH structure formed can't be predicted or controlled which is why multiple coats are often required. The size of the CSH structure formed will depend on the amount of free lime and calcium present in the concrete at the time of application, how much sodium silicate was applied, how the sodium silicate sealer was applied and by who, the density and porosity of the concrete surface, the PH of the concrete, present moisture, and more.

2. The CSH structure formed is identical regardless of the brand you use.  A silicate, is a silicate, is a silicate. Whether concentrated or diluted with distilled water, the CSH structure formed by Brand A is exactly the same as the CSH structure formed by Brand B. The difference between brands will be in the concentrated during the time of sale, but sodium silicates need to be applied at a very particular percent solids in order to react. Concentrated silicates are more cost effective simply because you can add your own water - instead of having to pay for it. Don't pay more for false warranties, claims, or guarantees. The CSH structure formed by a silicate is permanent no matter who you use.

3. Densifiers can reduce the movement of water and moisture through densification, but by how much can't be predicted or controlled. The CSH formed will determine how much water and moisture is reduced and the only way to test progress is by applying a coat, then testing. It is important to note that no matter how many coats of a silicate based sealer you apply, silicates can't stop Radon. Radon is a gas and gas can penetrate just about anything. The only safe way to reduce Radon is with a Radon Mitigation System and/or fan.

4. Densifiers are not crack repair products. A densifier can help to strength the inside of a spider crack (defined as a crack that you can't fit a piece of paper into), but it can't stop water from coming up through a crack and it won't bond the concrete together to repair the crack. If you have a crack you need a crack repair product which would be a silicone, polyurea, or epoxy based product.

5. Densifiers can't stop Radon. Radon is a gas, silicate sealers are breathable - surfaces sealed with a silicate will allow Gas to move freely through the CSH structure. While you might see a very slight reduction in Radon, the only safe way to reduce it is with a Radon Mitigation system.

A densifier is great to use if you are looking to increase the strength of and density of your concrete, or if you are trying to reduce the movement of water through the pores BUT if you require protection from staining, cracking, ice damage, mold, etc., you want to use a SilaneSiloxane water repellent (Armor SX5000). If you want a densifier and water repellent, apply the densifier first followed by the application of a water repellent 5-7 days later.


Armor SX5000 Penetrating Silane Siloxane Concrete Sealer and Masonry Water Repellent (5 GAL)

Armor AR350 Solvent Based Acrylic Wet Look Concrete Sealer and Paver Sealer (5 GAL)

Armor AR500 Solvent Based Wet Look High Gloss Acrylic Concrete Sealer and Paver Sealer (5 GAL)

Armor UTN60 Oil and Gas Resistant Aliphatic Urethane Concrete Floor Coating

5 GAL Armor S2000 Concentrated Sodium Silicate Concrete Densifier Sealer and Surface Hardener

Armor SC25 Siliconate Water Repellent Concrete Sealer with Salt Guard (1 GAL)