Hey, thanks for all the info!
Well, water definitely beads up instead of soaking in.
I think that Primer I sent my wife for only comes in spray cans. Oh, well.
Yes, “it’s what I have” is familiar. We picked up a gallon of Hunter Green Rustoleum, which as about three quarts more than needed for the trailer frame. So the plywood deck gets some of that. I’m thinking (hoping) that when I build the foamie to set on the trailer, I can paint it a complimentary pale green. Hmmm... now to go see if that “Metal Mist” I bought years ago from an employer surplus auction is really pale green.
I am surprised at how much mix the wood soaked up. But if it really preserves any wood that’s structurally adequate for the job, it sure beats buying that ridiculously high priced dark colored treated marine plywood.