exhibits flexural modulus about that of a plain ptfe glass fabric composite comprising the same reinforcement fabric and percent ptfe and has little tendency to curl should it be desirable ribs lugs cleats or other protuberances composed of rubber that is the same or similar in composition to the rubber face of the composite may be formed on the relatively smooth rubber face by applying beads of flowable uncured rubber by the use of robotically controlled applicators or by methods similar to those described in co pending application ser no 09 608 649 filed jun 30 2000 the subject matter of which is incorporated by reference herein the material applied is then cured depending on its type according to the procedures in the paragraphs above the rubber must be sufficiently viscoelastic to permit retention of its shape without flowing excessively during the time required to apply the required number of cleats and transfer the work to an oven or other heating device or other environment in which the cure is effected unlike other elastomers silicone rubber has low surface energy surprisingly the surface of silicone rubber is tacky when dry yet very slippery when water is present on the surface this feature of silicone rubber results in unique advantages and end uses which are contemplated by the invention fig1 shows an exemplary composite of the invention in which a fiberglass reinforcement 1 is coated on both faces with ptfe 2 a mixture of a colloidal silica dispersion 3 is applied to one surface.