I've never tried to repair a crack like that. I've read lots about people welding plastic to repair something like that. They usually save a chunk of the yak when rod holders are drilled.
Bass Pro and Cabelas also sell something called Hippo Patch. The Hippo Patch is a flexible "band aid" for kayaks and canoes. You might want to try a combination of both melted plastic and a patch on top.
|