Contains A Fungicide And Resists Mould Growth. The Sealant Is Extremely Resistant To Uv Radiation; Weathering; Ageing And Water; And Offers Excellent Chemical Resistance And Is Unaffected By Diluted Acids And Alkalis; Soap And Household Detergents. Not Suitable For Alkaline Surfaces Such As Concrete; Fibrous Cement; Asbestos; Plaster And Marble. Not Suitable For Fish Tanks (Contains A Fungicide).