The old skin should be bonded to the new transom with a 2 part epoxy. Best way is to thicken the epoxy to a mayonnaise consistency and trowl it on. Make sure you soak both faces with the epoxy liquid form before trowling. Prob should drill a few drain holes in the old skin for the excess to ooze. Make sure you clamp it real well and get that excess to ooze out the holes on the outter skin. Once cured start your finish work on the outside and make sure the epoxy is cured completely, polyester resin will not cure properly to semi cured epoxy.
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