The best preventative would be to take each spoke out(at least the nipple) and put some silicon under them to seal the water/salt out in the first place. Sealing over the nipples still allows water to get under the nipple and have access to the rim where it will spread out under the silicon . The couple corroded rims I have I took a wire wheel on a die grinder and polished of the corrosion and painted the entire area with a good corrosion inhibitor. Still no cure, just slows it down. Will be slowly replacing the rims with better Excel or similar and SS spokes with brass nipples(plated nickel). Will put a dab of sealer under the nipples and hopefully have it laced up before it cures so it can turn with the nipple till I'm done.
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