ARDEX K 55 FAST is a cutting-edge subfloor smoothing compound formulated for rapid hardening, ideal for projects that require minimal installation time for floor finishes. When mixed with water, it creates an exceptionally fluid, self-levelling mortar that can be applied in a single operation, ranging from a feather edge to a maximum thickness of 10 mm. Depending on the substrate and application thickness, the surface can typically be walked on within approximately 30 minutes at 20°C. Once sufficiently hardened, floor coverings can be installed as soon as 60 minutes later for applic