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Message: <blockquote data-quote="PSG-1" data-source="post: 239812" data-attributes="member: 6937">Yeah, that's what I said, except, the word I used wasn't 'crusties'  LMAOTook me over an hour with a chipping hammer and a large flatblade screwdriver to knock all the crap loose. In the process, I also found another use for phosphoric acid....removing barnacle and oyster residue. Since oysters and barnacles are made of calcium carbonate, acid will help dissolve them. But when they are growing on an aluminum surface, it's not safe to use strong acids like muriatic, those will destroy aluminum components. Phosphoric acid is one of the few acids that can be used on aluminum.After hitting it with acid, I power washed it with a 0 degree tip, which helped to knock most of the junk off there. Now it's a simple matter of replacing the zinc anode, and then painting all the aluminum surfaces of the power trim unit and the mounting bracket with some outdrive paint. Outdrive paint is cuprous thiocyanate-based, just like Trilux 33, or other bottom paints specially formulated for use on aluminum. The use of cuprous oxide-based paints will lead to very rapid corrosion.Since it rained last night, it's too wet to paint right now. As soon as it dries out, though, I'll be painting it, then checking on a few other things, then put it back in the water.</blockquote>