The best dock preservative is a dock that's 100% aluminum, with maybe a couple stainless steel items attached. In the slightly acidic water of Lake Winnipesaukee, an aluminum dock will thrive indefinitely, and has a half life of 5000-years before the individual molecules that make it aluminum start to leach out..... so's you can expect an all aluminum dock to be very usable, and continue with a strong physical appearance for five to 10,000 years.
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... down and out, liv'n that Walmart side of the lake!
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