Abstract: Disclosed herein is a method for forming a pressure seal between the flat mating surfaces of two structural members including the steps of texturing one of the mating surfaces by providing a plurality of intersecting grooves thereon so as to form a continuous grooved recess through the region where the pressure seal is desired, applying an extrudable sealant on one of the mating surfaces along a path generally corresponding to the desired path of the pressure seal, and clamping the two structural members together to extrude the sealant into the grooves, whereby the continuous grooved recess is filled with the sealant to provide a pressure seal between the mating surfaces and face-to-face contact is established between the ungrooved portions of the mating surfaces.