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Message: <blockquote data-quote="thill" data-source="post: 511592" data-attributes="member: 4972">I soak all of my plywood, especially the edges and cut areas with Thompson's Wood Preserver/Waterproofer.   You need at least two soaking coats, as it absorbs completely into the wood.   I generally do three applications, and if there are areas that aren't soaking on the third application, I use the roller to spread it over to other areas.  You want it really sealed well.Once it dries, the wood looks like nothing has been applied to it, unless you sprinkle water on it, which beads up like on a freshly waxed car.In my experience so far, any exterior carpet glue or solvent-based adhesive adheres well after waterproofing.  I've used Titebond III to adhere transom layers together, and it made a solid bond, and I have used carpet glue type that cleans up with water before it dries, as well as solvent-based Henry and they all worked well.Thompson's is inexpensive and has been flawless in performance for me.  Wherever I used a fastener, drilled or cut after installation, it only takes seconds to soak that area using a brush or rag to ensure good protection.I've also used epoxies, both thinned and un-thinned, and they work fine, but are expensive, and I haven't seen any better results with them.</blockquote>