Surfblock SB-12

Surfblock SB 12 is a 12% active solvent based siloxane/silane water repellent and impregnating agent for porous masonry surfaces such as concrete, block, brick, and unglazed tile. Surfblock SB 12 will penetrate and chemically bond deep within the substrate to provide long lasting protection against deterioration or staining due to water conditions. Surfblock SB 12 will not impair the natural breathing characteristics of treated substrates, nor will it produce a film. Helps concrete and masonry surfaces to resist common issues such as freeze/thaw cracking, efflorescence, spalling, staining, and other damages caused by intrusion of water. Can be applied to concrete surfaces previously sealed with (test prior to use) acrylic sealer.