NOVELTY - A sealant system (13) for a manifold (10) in proton exchange membrane fuel cell comprises low temperature silicone rubber bridges (14) between the end plates (9) to compensate for the uneven edges of various fuel cell component layers (8). A layer of elastomer (15) extends across the bridges and along end plates, around entire contact surface of manifold, to seal the manifold to the fuel cell.    USE - For reactant gas manifold in proton exchange membrane fuel cell (claimed).    ADVANTAGE - The sealant system is stable in the presence of hydrogen, oxygen and water and has low creep with good compressibility. The seal is effective to the pressure differentials experienced during fuel cell operation without leaking, and does not require periodic tightening of a manifold to maintain the seal over time. The sealant system allows easy removal of manifold.    DETAILED DESCRIPTION - A sealant system for reactant gas manifold in a proton exchange membrane fuel cell having plurality of fuel cell component elements with mutually uneven surface at ends, extending under compression pressure between a pair of end plates, comprises 1 or more seal part applied to mutually uneven surfaces and extending from one end plate to other at one or more regions. The seal parts have relative smooth surface facing manifold and coplanar with surface of end plates. The seal parts comprises low temperature-curing silicone rubber adhesive. Another seal part comprising an elastomer is disposed on each of the edges and end plates, around the entire contact perimeter surface of the manifold. The elastomer has low compressive set and low compressive modulus. An INDEPENDENT CLAIM is also included for a method of sealing the perimeter surface of reactant gas manifold to end plates and fuel cell component layers of proton exchange membrane fuel cell. A low temperature-curing silicone rubber adhesive is applied to regions of fuel cell layers that are to be sealed to manifold. Bridges with smooth, straight surfaces coplanar with the surfaces of end plates to which manifold is to be sealed, are formed. The silicone rubber adhesive is then allowed to cured. An elastomer having a low compression set and low compression modulus is then applied to coplanar surfaces of end plates and bridges. The manifold is installed on the fuel cell with contact perimeter surface being in contact with elastomer.    DESCRIPTION OF DRAWING(S) - The figure shows the elevation view of a fuel cell having a seal.    Fuel cell component layers (8)    End plates (9)    Manifold (10)    Sealant system (13)    Silicone rubber bridges (14)    Elastomer (15)