Eastwood company makes a polymer wheel repair kit that I have had excellent results with. Once cured it is impervious to hot/cold temp changes. I have used it a number of times. The process is time consuming,but it worth it if you are the do it yourself type. Once you have finished with filling and sanding of the wheel have the wheel painted at a local body shop and have them put on a number of coats of clear. If you don't feel like going this route there are a few companies out there that specialize in steering wheel rebuilding
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