Next I started on the platform mold. I used MDF that I sprayed a some lacquer first followed by a few layer of partall paste wax and PVA. Then I used clay in all the corners, a couple layers of gel coat and a couple layer of mat. Then 2 or 3 layers of 1708. For the core of the platform I used 3/8" corecell. I couldn't make the platform too think because I planned to use Armstrong hatches. After I bedded the core with epoxy I put 2 more layer of 1708. It came out really stiff. There's no movement when I stand on it.
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