Replacing transom core only

[Mulv80]

Maco, I've been to the Seacast site and I think that stuff is a little to pricey. I measured the amount I would need according to there formula and I would need 15 gallons. Seacast will cost around $600. I was looking to replace the core with 2 sheets of 3/4 inch marine plywood epoxied together then droped into the hollowed transom and epoxied.