A38 Rapid Set ScreedINFORMATION ARDEX A 38 ARDEX A 38 Rapid Set Screed is a precision engineered, polymer modified, cement screed that sets, hardens and dries rapidly. Use for interior or exterior applications including swimming pools and other wet areas. ARDEX A 38 can be walked on 3 hours after application and can receive tile or stone after just 4 hours, even when used as an unbonded or floating screed. After only 1 day, the compressive strength and tensile strength