Tef-Gel is made in Australia and to withstand the harshest of environments. Tef-Gel is a white very high viscosity gel which once applied to fastening, fitting and electrical fittings in high corrosion environments will ensure protection, serviceability and presentation of the assembled hardware. Tef-Gel is non-toxic and safe for eco system both on land and on the water. Tef-Gel is non-reactive and chemically stable, with an infinite shelf life it really should be in your tool box when working with dissimilar metals.