It has been stated that some resins such as epoxides or polyurethanes are self bonding on to stainless steel (B.P. No. 2,061,834) but these sufferfrom other disadvantages such as cost (epoxides) and low stiffness (polyurethanes).We have found a way by which excellent adhesion can be obtained between a metal and those thermosetting resins which are not generally considered as being capable of bondi