in the fuel tank hatch...don't over think it
Put a 1" wide strip of 1/2" pvc trim board (pine will work) under the lip, along the length of the edges. Temporary hold in place with a couple dabs of plain old silicone. Pre-drill a pilot hole through the existing holes in fiberglass. Screws
from the top will pull everything tight.
Be sure to silicone the hatch to be watertight!
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