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Beneteau 361 Keel Bolts
Green, Boeshield T9 is a cosmetic response. The waxy coating on the stainless bolt head will last for a while but wash off as water collects in the bilge and the boat is used (assuming the bilge sees anchor well water, sea water, rain water if the mast is keel stepped, etc.)
I would think the real question is whether the bolts are sealed totally vs. allowing water to work its way down the bolt-keel interface. In such circumstances, corrosion of the bolt can occur over time - obviously not a good thing. So...my suggestion would be to leave the bolts untreated for a while, while keeping the bilge dry, and see if the bolt continues to show surface corrosion. Perhaps you can try this in your winter layup. If I were to see continuing corrosion, I´d suspect the rest of the bolt.