Join Date: Nov 2006
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A cast iron keel in that size may be light enough to be removed from the boat and brought to a sandblast facility. If it can be thoroughly cleaned, then you can remove or drill out the old bolts and perhaps tap for new.
When you are working with clean cast iron, it can be coated with epoxy primer and something like VC Tar or Interprotect that will smooth it up and prevent future corrosion.
Good keel bolts are peace of mind when sailing hard.