TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The release agent is applied to the surface of the separate element(s). The groove network comprises closed groove segments. The closed groove segments comprise first groove segment in one of separate elements facing a second groove segment in another of the separate elements. The fuel cell assembly further includes individual fuel cells, and external sealing layer formed around the exterior of the fuel cell assembly. The fuel cell comprises separate elements having connection aperture that forms a connection duct of the groove network extending through each fuel cell. The connection ducts are interconnected and are connected to filling port(s) to enable a seal for all of the fuel cells to be formed.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The release agent is sodium lauryl sulfate, teflon sprays, vegetable oils, mineral oils, silicone fluids, fluorosilicone fluids, or soap solutions. The seal is formed from a seal material and release agent is added to the seal material. The release agent is silicone fluids, fluorosilicone fluids, mineral fluids, vegetable oils, fluorocarbon fluids, or soaps. The release agent comprises polydimethylsiloxane having a chain length of 4-50. The seal comprises ethylene/acrylic polymer, fluoro elastomer, ethylene propylene terpolymer, flexible or rigid epoxy resin, thermoplastic elastomer, or polyester elastomer. The polydiorganosiloxane is vinyl terminated polydimethylsiloxane having a viscosity of at least55 pascal (Pa).second, or a blend of lower and higher viscosity vinyl containing polydimethylsiloxanes so that the viscosity of the blend is at least55 Pa.second.Preferred Process: The seal is formed through injection of a liquid elastomeric seal material, and curing the elastomeric seal material. The formation of seal in fuel cell assembly further includes providing a liquid silicone elastomeric material as the seal material, and curing the seal material at an elevated temperature for a predetermined time, providing at least2 separate groove networks, injecting a separate liquid seal material into each groove network, and selecting the composition of each liquid seal material to provide compatibility with materials and liquids required for fuel cell operation and durability. The providing of release agent includes applying the release agent to surface of the separate element(s), selecting the release agent, and adding the release agent to the seal material.Preferred Composition: The release agent is added as 0.1-1.5, preferably 0.4-0.7% of the seal material. The seal material further includes (pbw) organic peroxide (0.1-5) in combination with platinum-type metal catalyst or in place of component platinum-type metal catalyst, inhibitor (0.01-5), and non-reinforcing extending filler (0.01-100).