To stick down uncoupling membranes such as those by Schluter and Dural, use ARDEX AF 200 PLUS. It is ready-mixed and can be applied using a B1 or 2mm x 6mm v-shaped notch trowel direct (without priming) to plywood, floorboards and dry concrete, as well heated and unheated sand and cement screeds and levelling compounds. After 5-10 minutes, the matting can be installed and then tiled or levelled immediately using an appropriate ARDEX Cement-Based Tile Adhesive or ARDEX Levelling Compound.