I was wondering if IslandPilot actually bought that boat, the nuts look pretty good. I am in the process of replacing 4 of my nuts because they sat in some bilge water while on the hard and got a bit rusty. Otherwise, we just applied barrier coat and biocide and our keel is solid, the bolts all look great and are clean. The process I am following (any and all comments are welcome) is to spray them with wd-40 every time I visit the boat for about a month, then get a top quality wrench that fits the nuts perfectly, carefully back each one off, clean the threads with some oil, then use the new washer and new nut and tighten to 70 foot pounds. I have purchased the yellow zinc/chrome coated nuts referred to in the article. I am doing this while in the water, at the dock, I don't see any risk to upgrading one nut at a time.