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AQUA Tite Moisture Blocker seals concrete by penetrating the surface pores. It reacts with loose calcium and lime to form a glass-like structure within the concrete, making it stronger. Moisture Blocker is not a surface sealant; it is an internal stabilizer. In most cases, there is no need to reapply Moisture Blocker over time- it is a permanent sealant for protection against moisture issues that can lead to mold, mildew, and fungus on concrete.