TUFCHEM II Membrane Spray Grade is a two component urethane-asphalt based membrane formulated for spray application. TUFCHEM II Membrane Spray Grade is generally specified to be installed in 2 or 3 passes over a primed substrate for a total 125 – 165 mil (3.0 – 4.2 mm) WFT nominal lining thickness. It can be used within its limitations to protect concrete, steel, and other substrates from permeation, chemical attack and abrasion. TUFCHEM II Membrane Spray Grade may also be applied by brush.