I have a 77 H16 that I am restoring. I modified the epoxy injection method described at the links below to repair my delamination problems. Early Hobies commonly had these problems. I drilled a series of 1/4 in holes systematically thoughout the delaminated area and injected Traveco's Gluv-It epoxy sealer into each. The area is rock-hard now and the delamination has not reappeared. I emailed alot of manufacturers about what type of epoxy to use, Traveco was extremely helpful (they also make Marine-Tex putty). Gluv-It remains flexible to a certain degree, so this should reduce further cracking and weakening of the area. Hope this helps, and also hope it isn't a breach of protocol to link to an outside page.
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<br>Links
<br>http://www.west.net/~lpm/hobie/archives/v1-i5/tip15.htm
<br>http://www.west.net/~lpm/hobie/archives/v1-i5/tip16.htm
<br>http://www.catsail.com/archives/v3-i4/feature1.htm<br><br>