Terrix® PR-ST-R is a coloured potassium silicate-based primer specifically formulated for the preparation of substrates prior to the application of silicate (potassium silicate) renders, such as Terrix® RD-ST and Terrix® RN-RC-ST. It is suitable for priming all mineral-based external elevations, including concrete, lime render, and lime-cement render, and is also compatible with Terrix® EWI systems.