[Paddlewise] Permanent Patch for Plastic Sea Lion?

I have two 1"-diameter holes in my stern tip on my Sea Lion from where I removed
my rudder.  These are currently plugged by a bolt/gasket/washer kluge that I
would like to replace with a permanent filler.  Any recommendations for
epoxy/stuff that would be most compatible with a Sea Lion's polypropylene and
that would keep these holes watertight in temperatures ranging from freezing to
high-90's.  I use the boat only in freshwater.  Thanks.

Tom Joyce


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