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Exterior finish for mahogany10/22
We need to finish100 African mahogany slats 2"x3", to be used for exterior benches. They were previously finished with an incorrect finish that failed in less than one year. (SWP exterior kem aqua was used by the original finisher). All of the slats have been sanded down and are ready to be refinished. The benches will be exposed to all of the elements of PA weather. Obviously, no finish will be indestructible, but it would be great to have something that would last longer than one year and would be able to be maintained in the field. I was thinking about some kind of a deck finish, oil based, but would appreciate any suggestions.
The best clear finish for exterior wood is no finish. Seriously. Or paint.
There is no miracle clear finish that will last more than a year with full UV exposure as well as rain/snow.
Oil is perhaps about the only choice near what they are asking for, but it will need to be recoated several times every year. And, you will have to keep people off of it until the oil cures.
On the upside, propose a contract to maintain the benches, 'as needed'. You will have work forever.
i agree with david.. .
I use Amteco's TWP. I've used them for clients garage doors and front doors/jams with it catalized for film build. I use it on my own mahog exterior deck railing appx 60ft non catalized. Non catalized it takes a few days +/- depending on weather to dry to the touch. Great thing for recoating before failure is just clean and rub down with scotchbrite. I would think if applied properly you'll get at least 2-3yrs.
ps: I'd also use a tinted finish for a longer maintenance cycle
Epifanes Marine Varnish will last many years if you follow the recommended yearly maintenance process of adding one or two additional coats. It's a pain to apply all 7 coats at the beginning, but it works.
We would recommend Milesi Wood Coatings XGC83 for the exterior mahagoany. It is specifically designed for this application. Milesi exterior products are high end European technology designed for professional wood finishers for these specific applications. To find more information please visit www.milesi.us.
i second the Epifanes varnish, especially if you first seal with Smith's penetrating epoxy
3rd vote for Epifanes. Follow directions about first coat dilution. Build up is achieved with successive coats and will look great after the 4th undiluted top coat.
If you need a Satin finish, you will need to apply two coats on top of the Gloss.
The best finish I have had the pleasure to work with, both in the shop and in the field.
Next would be a 2K poly.....but if it sees direct UV light, it will fail in time too.
Another vote for Epifanes marine varnish. I live in Florida, not one of those girly states, and I would use nothing else on a door. It is my understanding that the point of an epoxy under coat is for restoration if the finish fails. The stripper will not affect the epoxy and therefore you never sand or stain the wood again, but top coat again with varnish.