Pure White Anti Mould Silicone is a high quality, waterproof, superior anti-mould silicone suitable for most sanitary sealing and areas of high humidity. A fast curing, 100% silicone, Pure Anti Mould Silicone comes with a 10 year guarantee to stop black mould growth, ensuring the product stays bright and clean. Limitations: Releases acetic acid during curing. Therefore, it must not be used on mirrors and sensitive metals such as copper, brass and lead. Do not use for aquariums. Not for use on porous surfaces such as stone, concrete, marble or granite.