hi there if your rim is flaky its alloy yes , my 1985 43f xt had the same problem . i wire brushed them on the inside where the tube sits then some thinners on a cloth to clean them , then a light coat of hammirite smoothrite paint paying attention to where the spokes go through let it dry as per on the tin them one more light coat . i let mine dry for ONE WEEK then refitted the rim tape/ tube / tyres . i fitted more tyres some two years later and all was ok but i did lightly wire brush them and gave them a light coat of smoothrite just to keep on top of the job . the only bad part is to wait one week for the paint to harden before refitting the tyres . if your rims are steel use the same methard but get a wire brush that fits in a electric drill and get ALL the rust off, use goggles over your eyes . good luck zigzag
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