BeddingCAUTION: A stainless steel housing must be isolated from a metal hull to prevent electrolytic corrosion.Apply a 2mm (1/16") thick layer of marine sealant around the flange of the housing that will contact the hull and up the sidewall of the housing (see Figure 2). The sealant must extend 6mm (1/4") higher than the combined thickness of the hull, washer, any spacer, and the hull nut. This will ensure there is sealant in the threads to seal the hull and to hold the hull nut securely in place.Stainless steel housing in a metal hull—To isolate the stainless steel housing from the metal hull, slide the isolation bushing onto the housing (see Figure 3). Apply additional marine sealant to the surfaces of the bushing that will contact the hull, filling any cavities in and around the bushing