ULTRA LOK™ is a white, acrylic elastomeric, waterproofing adhesive, bonding Primer Sealer. A waterborne, latex based, high resin content formula that is specifically engineered for sealing and conditioning porous interior and exterior, above-grade masonry surfaces requiring a high performance primer. It tolerates the high pH common in new masonry and ensures a uniform look and long-lasting finish. It is highly alkali and efflorescence resistant and can be applied to surfaces with a pH of 6 to 11. ULTRA LOK™ revitalizes and strengthens the surface to which it is applied, preventing cracking, efflorescence, spalling and segregation. ULTRA LOK™ will bond, seal and waterproof most any exterior surface. Excellent penetrating characteristics enable ULTRA LOK™ to permeate into the substrate providing a permanent bond to the finish coat. On non-porous substrates, the high resin content provides excellent adhesion to the surface then forming a tight bond to the finish coat. The bond that is formed between ULTRA LOK™ and the finish coat eliminates any possibility of moisture under the finish coat thus extending the coating’s life considerably.