LI Grady said:
Chris
I would have thought that epoxy would do the opposite and seal/protect the wood.
Not surprising that West Systems claims its the best for teak then again about the only thing they don't claim it will do is cure cancer.
The goal of marine finishing development over the years is to get a harder and more weather resistant and durable finish. For a stable sub-surface, like metal or fiberglass, the harder synthetic paints and epoxies have been a godsend. But for wood, the biggest issue comes from adhesion, and to accomodate shrinking and swelling of the substrate.
Of all the woods, teak is probably one of the most stable, so better lends itself to an epoxy coating. So it will go on and probably stay on for a time, and look great. The downside is that you can never completely seal the edges of the finish so your'e always going to have problems with moisture seeping in underneath. Plus, the finish is so hard that it makes re-finishing a giant nightmare.
Same with polyurethane paints over wood. They look great and hold up will, but when adhesion becomes an issue, (which it always does) the paint stays intact over the lifting and the wood will litterally rot under the paint. Traditional alkyd enamel is still the best way to go for wood. For metal and glass, epoxy and polyurethane finishes for sure.
West System is great stuff, but there are places where traditional varnish finishes have their advantages. The brands I mentioned are traditional types, not urethanes, and provide a high level of UV protection. The ol' MAN-A-WAR varnish is okay for interior, but lacks the weather proofing needed for outdoor use. I'm pretty sure CAPTAINS was from Petit, and SCHOONER was from Interlux. My favorite yacht finishes were Interlux.
BTW, if you don't need a high-gloss finish, the oil of DEKS OLJA work quite well. Once you have an oil finish built up they have a gloss product to overcoat. It does however give a very dark appearance to the wood. With the oil finish, if you don't re-coat often you still get the graying appearance to the wood. Also, that gray look on teak is like an oxidation coating that protects the wood underneath. If you sand off the gray it's still teak-brown underneath.