#800 Elastic Cement is a water based, elastomeric flashing, patching and sealing compound. Elastic Cement is formulated with premium acrylic rubber resins, inert mineral pigments and non-asbestos fibers to form a permanently elastomeric water-proofing and sealing compound. When cured, #800 Elastic Cement forms a tough, flexible, elastic membrane that can withstand greater stress than ordinary plastic roof cement, flashing compound or even modified plastic cement. #800 Elastic Cement is a heavy bodied compound that can be brushed or troweled (brush application is recommended).