Renderoc ST05 is a Protective Cementitious Coating and levelling mortar for applications from feather degs to 5mm conforming to the requirements of BS EN 1504-3 Class R4. It can be applied in thin layers for filling blow-holes or imperfections in concrete to produce a smooth surface. Renderoc ST 05 also provides a chloride and carbonation barrier and can be left as a fair-face finish or over coated. It can be used as a scrape-coat, brush or trowel applied, placed in thicknesses from 0-5mm.