Thanks both.
I'll try sharkhide. I did not think about the toons being coated, which they are below water level.
&, I mentioned the bolts (fasteners) . . . I stumbled onto that after the job was done.
dang.
Oh well, the originals lasted almost 20 years, and I probably won't.
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I found this on Sharkhide's website . . . it's a little disappointing:
In the marine industry, SHARKHIDE is used primarily on aluminum hulls such as Pontoon boats, Houseboat, and Fishing boats. In most instances, a couple of good coats can last many years. It's not uncommon to see three to five years of protection.