3. Mount the Deck Hinges
Place pieces of masking tape on the mounting surfaces and use the deck hinges to mark the mounting holes for each. Before drilling the mounting holes, be sure the underside is clear of items such as hoses and wires. After drilling, chamfer the holes with a countersink to eliminate gelcoat cracking, and then remove the masking tape, bed the surface with a marine polysulfide sealant and screw each deck hinge into place (use nuts and bolts where possible), cleaning up the excess sealant with a rag dampened with solvent.