Total Foam N’ Base Coat is a 100% acrylic emulsion blend that is designed to be mixed with Portland cement in a 1:1 ratio by weight.
 
Foam N’ Base serves two functions:
It produces the adhesive that will bond rigid polystyrene insulation board to raw masonry, exterior gypsum, Dens Glass, and cement board.
It produces the base coating that embeds the reinforcing fabric over the face of rigid polystyrene insulation.