Broken Trolley Scupper Holes

I have just baught a secondhand blue Kona to set up as a fishing kayak.
Both trolley scupper holes are cracked, as someone has stood in the kayak while it was on the trolley. I was thinking about putting a slieve around the scupper, or, perhaps just covering the top and bottom opening so it is totally sealed. Is there a prefered method of repairing this, or have I just wasted my money? Help please....

I have read that you can split a length of PVC pipe and then cement the halves around the scupper tube inside the hull.
Don't know what the best cement to use would be but I do know that you will need to sand the scupper to both clean and roughen the surface for the glue to bond.
Hope this helps.

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Bozzie,
Roadrunner has reported successful repairs using Scotchweld DP8010.
A search for his posts will yield a lot of info such as
viewtopic.php?f=11&t=11245