There are a few different types of sealers that can be used to seal basement walls and floors. Which basement sealer is best for your basement depends on several factors. Here are the best basement sealers, and when to use them:

1. Sodium Silicate Sealers. Sodium silicate sealers will chemically react with the free lime and calcium in concrete to form CSH within the pores. Through densification, the movement of water and moisture will be reduces. The size of the CSH structure formed is dependent on several factors, and can’t be predicted or controlled. For that reason, how much water and moisture is reduced will vary from application to application, coat to coat.
2. Silane-Siloxane Sealers. Silane-Siloxane sealers are not designed for moisture mitigation, but some manufactures, like Foundation Armor, have proven that with their formula, you can see up to a 15% reduction in moisture within a 24 hour period.
3. Epoxies. Not all epoxies are treated equal. Most epoxies will peel when moisture becomes present, but some epoxies, like the Foundation Armor 2 part epoxy and the Foundation Armor moisture mitigating epoxy, will reduce moisture down to less than 1/2 lb of moisture. To put that into perspective, most flooring installers require your floor to be at 3 lbs or less.

If you have cracks in your wall or floor, or water coming in through the coveseam (where the floor meets the wall), you need to use a concrete repair product, not a sealer.