A method for the adhesion of a layer of fluorosilicone rubber which is curable using a non-hydrosilylation curing process to a layer of silicone rubber which contains substantially no perfluoroalkyl groups and which is curable using a non-hydrosilylation curing processes described. The comprises the steps incorporating either a hydrosilylation catalyst or a siloxane containing at least two silicon bonded hydrogen groups into the fluorosilicone rubber composition prior to curing and incorporating the other of the hydrosilylation catalyst or the siloxane containing at least two silicon bonded hydrogen groups into the alternative silicone rubber composition prior to curing; forming the products of step (i) and step (ii) into required shapes; bringing the shaped products of step (iii) into contact with each other; and adhering the shaped products in contact with each other together by effecting a hydrosilylation reaction therebetween.