I have a boat with a "toerail" fixed to the deck by stainless steel self tapping screws. Leaks have developed, probably between the screws and the aluminium toerail. Would it be a good idea to look for some sort of "washer" the put between the screws and the toerail (the whole system would benefit from electrolytic isolation anyhow)? Where can I find them? The material must resist compression and be watertight.
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