A water-based solvent-free acrylic dispersion primer to be used as a primer/ bonding agent prior to the application of any of the Screedmaster range of smoothing compounds. In undiluted form it can be used on all smooth & dense surfaces power floated concrete ceramic tile quarry tile rigid metal terrazzo asphalt & surface membranes. In diluted form (1:2 with clean water) it can be used on porous substrates including sand/ cement & wooden boards etc.