ARDEX MULTIPRIME is a water based primer for improving the adhesion of the various substrates, and also suitable for internal and external walls and floors. ARDEX MULTIPRIME is not suitable for glazed, impervious or silicone treated surface. ARDEX MULTIPRIME is compatible with ARDEX ceramic tile adhesives, ARDEX LQ 92, ARDEX Superflex waterproofing membranes and ARDEX Green Slab Seal.