Metal salts of acrylic and methacrylic acids are normally used with peroxides to increase the cure state of saturated and unsaturated rubbers. In addition, they also have been found to increase the adhesion of the rubber to untreated metals and synthetic fibers. In this context, they offer several ways of bonding rubber to metal that are far less intensive and time consuming than the procedure required for conventional adhesives. They may be mixed with a rubber compound as coagents to function as international adhesion promoters on curing. They also may be mixed with a rubber compound to form an adhesive strip that can be used as a tie layer between various rubber compounds and metals. This technique may be applied to either sulfur or peroxide cured stock. And finally, they are available in the form of reactive dispersions, where they may be applied as pastes to either the rubber or metal surface prior to curing.