Do you mean it’s cracked? I have fixed the wheel in my 49 BL using a product called JB Weld, a two-part epoxy. On the larger cracks and there were many, I put in small pieces of plastic to give the epoxy something to hold onto and make the repaired area stronger. After letting it dry for several days and some re-applications of epoxy I sanded it and painted it in a semi-gloss black. Several years later, no new cracks have appeared.
Larry Lewis