4Protection (Sealer for Limewash and Lime based plaster)4PROTECTION Protective Clear Coat for Lime Plasters and Limewash Paints by San Marco, 1L Clear Water Based Penetrating Clear Coat. Low VOC. Use 4PROTECTION on top of lime plasters, venetian plasters, and lime paint (Limewash) to achieve a layer of protection on mineral lime plasters and paints without affecting the sheen and finish of your material. Enhances protection against stains and stops water absorption with minimal change in sheen. Apply by