I'd probably go with some sort of urethane floor paint. I've used a lot of latex porch paint in houses and even in my bus. On the bus I used it to protect the plywood surface until I put down something permanent, which it's done very well at over the years. In real use you'd want something tougher. That be urethane porch paint. You could use epoxy but it doesn't hold up to UV light.
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