Elmer's ProBond concrete bonder is a professional strength adhesion promoter that enhances the performance of materials like cement, stucco and plaster. Whether your project is made for the indoors or outdoors, using ProBond concrete bonder will help fortify the bonds between layers of cement, stucco or plaster. It may be brushed onto existing surfaces or added to concrete mix to improve strength and adhesion. Our formula is available in 1 qt bottles.