Thread: Transom question thoughts

Not sure what apa plywood is but your transom wood should be pressure treated. 5200 is good stuff but Thompsons water seal will breakdown in 6 months. If you want a wood finish use spar varnish. If you just want to seal the wood I would paint so you can tell when the wood is exposed later and reseal. I'm not an expert but I have built a few boats and this is just my opinion.

Tony is correct on the Thomson sealer is a temporary solution. I'm no carpenter but my dad was a painter and he didn't care for Thomson sealer.

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Don't use treated wood the newer treated wood is treated with a copper product, it will cause aluminum to corrode. (google it and see what I mean) I don't even use it on my runners for an aluminum boat. Use some epoxy or polyester resin and thin it with acetone and brush on. Either this or the spar varnish. I have an old Montgomery Ward V bottom that I cut my parts out of 2x12 material and ran it through a planer to make it about 1 and 1/8th inches thick and put 3/8" plywood on the outside of the boat I found some spar varnish cheap an used it to coat. However I believe the epoxy or polyester resin is better. That is what our local bass boat repair shop does when repairing wood floors or transoms on bass boats.

Go do a search on the website tinboats.net on the topic. The guys there are adamantly against using PT plywood for the reason already mentioned. They also have a good sealer that is made by combining a few different products. I think its linseed oil, varnish, and another product.

That is true about the new treatment not being compatible with alum. That's somthing that i didn't think about. Only stainless steel or brass for fasteners. Glad someone corrected that. My boat work has been wood only.

Thanks, i decided to redo it with spar varnish. Will post picks when im done.

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Ollie's discount store in Madison had a good price on a good brand spar varnish, I bought a gallon a month or so ago for my boys to use on the wood in an old aluminum V bottom that I gave them to fix up.....might save a little money if you have not already bought it.