I am in the process of re-wiring my boat as well. I do not need to, but I have noticed corrosion has start on exposed wires. I am using the Tinned Copper wire that you can purchase at West Marine. The Tin liner helps to prevent corrosion and extends the life of the wire drastically. The other thing that I do to prevent corrosion is to use liquid electrical tape on the exposed wire, then I put heat shrink over that as added protection. No matter how you do this, you will have exposed medal... Use a corrosion-proof insulating film again is easily found at any Marine store.
If you use Youtube, I would suggest doing a youtube search for boat wiring to give you some great examples on how to do this the right way and make it look good and last even longer.
Good luck
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