Hatch seal repair question

Hi Group,
During the monsoon S. Ont enjoyed over the long weekend, I noticed that
one of my hatches on the foredeck leaks. I had repaired it 2 years ago.
At that time I removed the hatch and frame completely, cleaned the area
and used Sikaflex to seal it. I noticed that the frame screws were not
going into much other than the fiberglass and the foam core. I was
wondering if anyone had some suggestions on what I could use to make the
screws hold better as well as what the best material would be for the
frame-to-fiberglass seal.
I have seen putty advertised for RVs, and would like to know if anyone
has tried it. I read one of David Pascoe's articles regarding sealing
leaks and I would like to try the creata-gasket method, using shims,
however I will have to improve the holding power of the screws in order
to try it.
I would prefer not to dig out the core and replace it with wood as I am
not at a shop and only have hand tools. Has anyone tried the plastic
anchors that work in masonry?
Any ideas?
Thanks
Kevin

<a style='text-decoration: underline;' href="http://www.bosunsupplies.com/Sealants.cfm" target="_blank">www.bosunsupplies.com/Sealants.cfm</a>

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Charles T. Low
ctlow5.DeleteThis@boatUNdocking.com - remove "UN"
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<a style='text-decoration: underline;' href="http://www.ctlow.ca/Trojan26" target="_blank">www.ctlow.ca/Trojan26</a> - my boat

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"Kevin & Debbie" <kevdeb.DeleteThis@golden.net> wrote in message
news:40B3C00C.4000600@golden.net...
 > Hi Group,
 > During the monsoon S. Ont enjoyed over the long weekend, I noticed that
 > one of my hatches on the foredeck leaks.... Any ideas?
 > Thanks
 > Kevin
 ><!-- ~MESSAGE_AFTER~ -->