It is probably R.I.M. Urethane or similar material.
- Clean it with isopropyl alcohol only. Do not use a chlorine based cleaner.
- Then you can repair with a TP-E epoxy mixed in equal parts. Put a heat lamp on it for 15 minutes, sand, and paint.
You should be able to find TP-E epoxy at an auto parts place or an autobody repair shop.
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