Form This specification covers polythioether rubber fuel resistant sealing compounds supplied as a two-component system which cures at room temperature. Application This product has been used in aircraft integral fuel tanks for repair of fillet and fastener seals and faying surface seals as well as initial sealing of faying surfaces@ overcoating of fasteners@ and sealing of seams and joints@ for service from -80 to +320 ??(-62 to +160 ??@ with short-term recurring exposures (approximately 6 hours) up to 360 ??(182 ?? but usage is not limited to such applications. This product is not recommended for use on aircraft windshields or canopies or other applications where crazing or degradation of plastic components may occur. Sealing compound must be applied at temperatures above 50 ??(10 ??@ but will cure at lower temperatures. Notice This material is mixing ratio sensitive and will cure at temperatures as low as 20 ??(-7 ??. Normal mix/freeze operations used with polysulfide sealants are not adequate.