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Polymorph is a commercial grade thermoplastic that softens enough to be formed into any shape you like. Simply heat the pellets in hot water and then it hardens as it dries, forming a tough plastic material similar in consistency to Nylon plastic. Can be drilled, sanded, ground, machined or heated and reformed again
We have used this successfully to repair cracks in the Mirage well of old Hobie kayaks, by using it to form a thick reinforced backing to glue (using Marine Goop) onto the internal part of the Mirage well. We recommend that the crack be welded from the outside first, but we have seen this method work without welding.
The recipe and directions are as follows (example pictures coming soon):