High Temperature Silicone: One component, acetic cross-linking silicone sealant. Excellent resistance to high temperatures up to 300°C, maintaining its elasticity, a perfect seal and exceptional resistance to water, gas, petrol, fuel oil, anti-freeze. Its high elastic modulus and excellent adhesion to various types of material make it particularly suitable for cylinder heads, caps, flanges and piping in internal combustion engines. It is also suitable for use in heating plant boilers, connectors and ducts, in heat exchangers etc… Not over-paintable.