A semi-transparent, off-white acrylic water-based primer with excellent waterproofing and alkali resistance, for absorbent surfaces such as plaster, concrete and plasterboard. Recommended before the fiber-reinforced mortars VIVEFLEX 100/200W and the insulation renders VIVECRYL TOP ACRYLIC/SILICONE, improving their adhesion and workability. Part of the THERMOPROTECT system.