sticksteering is right. I use resin on any wood I put in a boat. He is right...50/50 for the first coat so it will soak, then put two more coats over that.
You won't have to worry about it after that. No need for using treated wood if your going to use resin...resin will soak into dry wood better...once you have it resin coated you'll never have to worry again unless you do not coat it well or you drill holes that are open for water to get into.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15