Water-soluble, silicone-based, acrylic primer, suitable for silicone-based and acrylic plasters. It stabilizes and reduces the absorbency of surfaces resulting in an unbreakable adherence of all plasters in paste form. Ready to use on any porous surface, such as concrete and topcoat plaster, drywall and cement board. Designed to work with silicone and acrylic plasters in paste form, such as HYDROSTOP SILICONE PLASTER, HYDROSTOP ACRYLIC PLASTER and HYDROSTOP THERMO PLASTER of DUROSTICK.