ARDEX A 46 is a rapid hardening, rapid drying, slump-free mortar for internal and external repairs. It is ideal for repairing and resurfacing concrete stair treads and risers and concrete subfloors. Also for filling and patching cracks in walls, ceilings, window, and door frames and can be used to form ramps from 2-30mm. Mixed mortar sets after 15-20 minutes and can subjected to foot traffic after 2-3 hours at 20°C.