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4 more options:
You can try applying a second coat to the first.
Try stretching some polyester cloth over the opening. It can be heat shrunk then make your part over it with composite and epoxy.
Using a similar technique make a mold from some layers of duct tape.
Get some two part foam You mix it just before you use it. It cures hard.
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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