Thixotropic oxime silicone paste used for formed-in-place gasketing and sealing applications in plant maintenance and various sized OEMs.LOCTITE SI 587 is a metallic blue, thixotropic oxime silicone paste used for gasketing and sealing applications in plant maintenance and various sized OEMs. As a formed-in-place gasket/sealant, it has been designed to give outstanding performance in typical automotive gasketing applications. This product is typically used in applications up to +500 F (+260 C).