of the metal sealing film stretching of the article tends to progressively smooth undulations folds and wrinkles in both the intermediate elastomeric layer and in the correspondingly undulated metal layer without destroying the integrity of the metal seal or barrier according to a still further process of making an improved prophylactic article the outer surface of the elastomeric article is molded to provide undulations wrinkles or folds in its outer surface thereby increasing its surface area after molding the surface is coated with a thin ductile metal layer preferably while in a stretched state so as to ensure that the metal layer coats all portions of the undulated surface but even so one may also coat a device while in a relaxed state and the same is provided for in example 7 below the device coated is a flexible electrode it is also thought there can possibly be formed undulations wrinkles or folds in an elastic layer by surface abrasion or by chemical treatment of an elastomeric layer 39 s surface such methods of surface preparation could be performed while the article is disposed on a mold and stretched or maintained in its relaxed state afterwards a thin coating or film of ductile metal such as aluminum is then applied over the undulated surface following and sealing the undulations folds and wrinkles in a continuous covering in all of the processes herein disclosed ductile metal layers can generally be applied by vapor deposition under a vacuum or by metal sputtering or electroless deposition and the resulting metalized article can be repeatedly stretched and relaxed without fracture cracking or breaking of the thin ductile metal layer it will be appreciated by.