Lift keel bolts and galvanic corrosion

[Trailer_sailor]

Hi All

I'm just about to do some maintenance on the keel winding mechanism of my Swift 18 and have been thinking about the three lower bolts which secure the mechanism to the keel. The keel looks like cast iron. I have no idea about the bolts currently fitted. You cannot see them with the keel raised. However regardless of the state of them it would seem sensible to replace them while the mechanism is out. The bolts are below the waterline.

Would replacing them with A4 stainless, coated in duralac, be a sensible solution? Or is there a better one?

 

[Tranona]

316 bedded in a sealant like CT1. 316 is commonly used into cast iron with a sealant to exclude water from the threads and if a bolt under the head.