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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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