WPA 560 Moisture Seal is a two part, water-based epoxy primer designed as a water and vapour proof coating under waterproofing membranes, ceramic tile adhesives*, levelling compounds* and timber floors. (*additional priming required). WPA 560 withstands hydrostatic head of water pressure up to 25 metres or 250kPa, complies with AS 4020:2005 “Products for use in contact with drinking water”, complies with ASTM E96 for water vapour transmission and has a convenient mixing ratio, 1:1 by volume.