I removed the hatch and cut off the skin above the old core. Chipped out the old wet balsa core and ground down the entire underside. Wet out the entire surface with poly resin and laid down at wetted out sheet of Matt, 1/2" core cell which I had beveled off. Wet that out and finished with a layer of mat and then a layer of woven. Covered the whole wet area with wax paper, laid it wet side up on the shop floor and added 200 lbs of weight to keep or flat.
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