Schluter®-PRIMER-U is a ready-to-use universal primer used to enhance adhesion of mortars for hard-to-bond substrates such as gypsum underlayment, existing tile, terrazzo, steel (e.g. raised access panels), flooring adhesive residue, concrete with curing compounds, latex paint, and glass tile.
PRIMER-PS is a ready-to-use, quick-drying topical primer designed specifically for Schluter’s peel and stick membranes. It is formulated to enhance the bond of peel and stick membranes to difficult-to-bond-to surfaces such as OSB, plywood, gypsum concrete, or vinyl. PRIMER-PS can be used in interior applications where increased adhesion is required over various porous and non-porous substrates.