Spar Urethane on Construction Pine for Outdoor Furniture

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Forum topic by paxorion posted 01-20-2014 03:33 PM 2057 views 0 times favorited 6 replies Add to Favorites Watch
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1107 posts in 2248 days

01-20-2014 03:33 PM

Topic tags/keywords: pine finishing

LJs – I am thinking of building 2 of these workhorses and was hoping to use construction grade pine (likely 2×12’s ripped). I am looking to leave the finished product outdoors (uncovered) and wanted to know if spar urethane would be sufficient protection for them if recoated every few years, if a different finish would be better, or if I should like for a more weather-resistant non-PT lumber?

-- paxorion

6 replies so far

View a1Jim's profile


117330 posts in 3779 days

#1 posted 01-20-2014 03:54 PM

Spar varnish should hold up very well.

-- wood crafting & woodworking classes

View Lee Barker's profile

Lee Barker

2170 posts in 3053 days

#2 posted 01-20-2014 04:41 PM

Spar urethane, I just learned on LJ, is not the same as spar varnish. If I recall correctly from a recent discussion, spar urethane does not hold up well outside. I hope one of our coatings gurus can weigh in here and correct me if I’m wrong as well as explain exactly what the OP is looking for.



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Manitario's profile


2685 posts in 3085 days

#3 posted 01-20-2014 04:54 PM

I haven’t had very good results from “Helmsman” spar urethane, rarely has the finish survived a year without starting to peel. You may want to use a marine varnish like Epifanes, it will last a lot longer!

-- Sometimes the creative process requires foul language. -- Charles Neil

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1107 posts in 2248 days

#4 posted 01-20-2014 04:56 PM

Lee – I’m hoping to apply some sort of finish that will provide water resistance for the workhorses to be left outdoors year around. I’m in Virginia where we see all the seasons, albeit more mild than elsewhere. I’ll look into the difference between spar urethane, spar varnish, and any other outdoor deck sealer that can be an option.

-- paxorion

View gfadvm's profile


14940 posts in 2892 days

#5 posted 01-21-2014 01:48 AM

The sunlight is what wrecks the Spar urethane. I have had it peel/crack without ever getting wet. The ideal outdoor finish doesn’t exist if you’re looking for maintenance free. My best friend uses some kind of oil on his log home that the log home people recommended and he is happy with it. But he does redo it periodically.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View paxorion's profile


1107 posts in 2248 days

#6 posted 01-21-2014 02:32 AM

Regular maintenance is OK for me. I don’t mind adding to my annual maintenance routine for my deck. I’m mainly concerned with preventing wood rot due to moisture exposure.

-- paxorion

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