Not sure about the corrosion you would get being on a sailboat all the time,but have you tried to powder coat your tools?When I worked on a commercial site I had all my wrenches,pliers,hammers powder coated in a bright red.It held up extremely well,except the hammer face its self(watch the first couple of hits as the coating really flies off.)Plus the bright color made it easy to see my tools when I dropped them. Hope this helps you.
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