Blue silicone paste gasket maker in an aerosol can, compatible with PVC materials, with a 24 hr cure time.LOCTITE SI 5019 (known as LOCTITE SUPERFLEX BLUE RTV SILICONE ADHESIVE SEALANT) is a blue silicone paste gasket maker in an aerosol can, compatible with PVC materials, with a 24 hr cure time. Minimum to maximum operating temperatures are -65 °F to +500 °F (-53.89 °C to +260 °C).