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Do circles on the 325 until you get past the corrosion and then change the tape and go to the 1k IMO.

The biggest and best lesson I have learned from buying blades with frowns, corrosion at the bevel or uneven hone wear is to be more selective in what I buy. Avoids a lot of time, energy and $.

+1 to getting past the pitting. On blades with corrosion the first thing I do is hone past the pits if possible. No point in wasting time sanding a blade that won't take a bevel without falling...