I think getting that rim sanblasted so you can inspect it thouroughly would be the best call.
seems most times the flaky rust looks worse than it really is ...but after blasting you will be able to clearly see how deep the cancer is and make a decision from there on its condition, last rims I had blasted at my local monument place was like $5.00 each.
Tim


1952 Chevy Shortbed

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If It Aint Broke Fix It Till It Is!