PRO-STICK 88 Premium Clear Spread Adhesive can be used over the following: above, on, or below grade concrete in the absence of excessive moisture and alkalinity, APA registered underlayment plywood, association grade particleboard, existing well-bonded resilient flooring, poured in place and primed gypsum subfloors, radiant heated subfloors where surface temperatures do not exceed 85ºF (29.40ºC), existing cutback residue, and terrazzo. Moisture levels of concrete slabs should not exceed 90% RH according to ASTM F2170 test method, must be 8 lbs. Or less per 1000 square feet per 24 hours (2.27 kg/92.9 m2/24 hours) using anhydrous calcium chloride test according to ASTM F-1869, and pH must be between 5 and 9.