The 388's hull is built using a resin-infusion method EdgeWater calls SPI (Single Piece Infusion). Stitched reinforcement materials are arranged in female tooling and sealed with a plastic membrane. A vacuum is drawn and catalyzed vinylester resin is flowed into the material to form the laminate. This includes the wetting out of the reinforcement surrounding the foam-cored stringers and web frames, eliminating problems with secondary bonding. The process allows precise control of the resin content and produces a stronger, lighter, and more consistent result than conventional hand lamination. Once the hull is complete, voids between the stringers are filled with foam and the deck/liner molding is bonded and mechanically fastened to the hull. According to EdgeWater the 388 is unsinkable. Hulls are finished with Imron and the deck, liner, and console are finished in gelcoat.