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#1
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Water based polyurethane for exterior finish
I've been building a backyard gazebo for a client part time for a couple of years. He's a bit eccentric, the thing is way over built, or over designed anyway, but I'd like to finish it and have the pictures for my scrapbook.
He spent way too much money on mahogany doors and windows (it's enclosed) and the oil based polyurethane degrades in the sun way too quickly for my liking. Re-coating the thing every year is just not preferable. The fellow at the local hardwood supply outlet swears that water based polyurethane lasts 4 or 5 years under UV before needing re-coating. I used it for some mahogany on a shower seat and floor grate in a bathroom that has no curb or curtain, the entire floor is the shower bottom and drain. Again, this was on his advice for longevity. That stuff has been in for a few months so I don't know yet about long term performance. Anybody experienced with this stuff? It's sure nice to use.
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1986 300SDL, 362K 1984 300D, 138K |
#2
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Water based varnishes don't add character to wood the same as oil or even polyurethane, something to consider with mahogany. Try a test piece before you coat the whole door. A varnish for marine use might work better.
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#3
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That's what I would have thought but the mahogany I used it on for the bathroom job came out looking all right.
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1986 300SDL, 362K 1984 300D, 138K |
#4
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I don't know about finishes for wood, but I think water-based paints tend to be more durable in exterior applications. I think it's bcause they have better elasticity than oil-based paints. The latter get brittle after awhile and begin to fail.
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles |
#5
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Could be. I know this spar type varnish is not lasting in the sun worth a damn. Brittle and chipping.
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1986 300SDL, 362K 1984 300D, 138K |
#6
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If you really want to know call up these guys:
http://www.fpl.fs.fed.us/ The government pays them to figure these things out. I don't think they get a lot of calls so will be happy to talk to you. I called them once about one of their reports and they connected me to the guy who wrote the report. Mike
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
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