Silicone black form-in-place or cure-in-place gasket/sealant for engine applications. Excellent bead height and profile. Easy to dispense.LOCTITE SI 5905 is a black, 2-part, thixotropic, oxime silicone, form-in-place gasket/sealant paste. The product can also be used for selected cure-in-place applications. It has excellent bead height profile, is easy to dispense, and has good resistance to most engine fluids. Applications include rigid/flexible flange covers made from metal or plastic, timing covers, and oil sumps.