I would try using the brace and sitting the kayak in the sun. It should work. The problem probably occurred as your kayak was sitting on a on your vehicle in the sun with most of the weight supported in one spot. (Maybe at the BBQ) As the plastic got soft, the place that carried the weight became dented. This material as a very good memory. Reheating without the pressure should do the trick.
The deck of most kayaks is much stronger than the hull. It is the spine of the boat. If you have to transport or store a kayak in the sun, flipping it upside down so the weight is supported by the deck will minimize this kind of problem.
Bob
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