SikaTop Seal-107 Comp A is the liquid component of the SikaTop Seal-107 system, a two-part, polymer-modified cementitious waterproof coating that forms a flexible yet durable slurry. Component A is mixed with the dry Component B powder to create the waterproof mortar for protecting and waterproofing concrete and masonry in interior and exterior applications, such as basements, tanks, and wet areas.