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.

• Ideal for use with Schluter SET, ALL-SET, and FAST-SET thin-set mortars, and Schluter underlayments such as Schluter-DITRA and DITRA-HEAT
• Ready-to-use, single-coat application with roller or broom
• One-component, solvent-free, water-based acrylic formulation
• Low odor and zero-VOC
• Freeze/thaw stable