Thanks for your interesting reply, d_r. I didn’t know that. Aquarium hobbyist magazines of the day never recommended anything except marine varnish, without ever going into the whys and wherefores. And I had a little Windmill-class sailboat that was varnished all over instead of painted (Hey, who doesn’t love the look of varnished Home Depot plywood, doesn’t get any classier than that) so I had lots of cans of the stuff lying around.
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