Larsen Weld-Crete and Plaster-Weld bonding agents have been specified by major architects, engineers and construction companies throughout the world since 1952. Use Larsen bonding agents wherever you require a high performance bonding of cementitious material direct to structural surfaces.

With industry leading efflorescence control and broad color palette, OBP products are engineered to meet applicable ASTM, Department of State Architect (DSA), Los Angeles Research Report (LARR) and Cal Trans requirements. OBP products are tailored to specific applications – concrete block, pavers, stone veneer, brick, tile, precast, manufactured stone and similar masonry products. OBP also manufactures a wide variety of blended cement products, including concrete, cement plaster, water proofing and numerous specialty blends.