The difference between marine plywood and exterior grade plywood is the quality of the veneers. Marine ply cannot have any voids. The glues are the same.
When sealing any wood, and particularly plywood, the most important thing is to seal the end grain. That's where the majority of the water comes in, and moisture coming into the end grain brings rot spores with it. Anything that will seal up the end grain will help preserve the wood.
The best material you can use to seal plywood is an epoxy sealer such as WEST system. But epoxy is not cheap. My next choice would be a good enamel paint, with several coats on the end grain. The one thing I would never use is polyurethane varnish: it does not hold up in exterior use, spar varnish is better in this respect.
Why anyone would treat wood with used motor oil is just beyond me. I guess there are folks out there who are even bigger cheapskates than me.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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