If there is only light to moderate kerbing to the rim, then it can be sanded out till it disappears, then polished
best way to deal with it is to use a DA sander to carefully re profile the lip, starting with 120 grit, 180, 320, then wet/dry 400. 800 1200, then polish, any chunks that are missing should be TIG welded, cracks and the wheel should be regarded as scrap! you should be OK to sand out any damage that is up to 2.5mm deep...
Thom