QUIKRETE® Advanced Polymer Mortar Joint Sealant (No. 8620-18) is a solvent and isocyanate free line of high-performance, commercial-grade material that permanently seals and waterproofs mortar joints with textured matte finish. Designed to deliver or exceed the performance of traditional polyurethane or silicone sealants and adhesives, the single-component QUIKRETE® Mortar Joint Sealant meets ASTM C920 standards. Available in 10-ounce tubes.