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Spar urethane over latex paint?

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Forum topic by DJ14 posted 02-11-2015 04:11 AM 6092 views 0 times favorited 9 replies Add to Favorites Watch
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DJ14

4 posts in 702 days


02-11-2015 04:11 AM

Hello all!

I’ve been making Adirondack chairs for a while but have never painted them. I now have a couple of people that want some chairs painted in bright colors. Fine. But can you put a spar varnish over latex paint? These will be subjected to harsh mountain sun/snow in NM.

Thoughts?


9 replies so far

View Fred Hargis's profile

Fred Hargis

3947 posts in 1959 days


#1 posted 02-11-2015 12:18 PM

What are you trying to achieve? Urethane varnishes are really bad in high UV environments, and there are better coatings for chairs than latex paints (if you refer to wall paint type products). I would use a good exterior 100% acrylic paint, probably over a good oil based primer. That will be about as durable as anything you can apply. These are sometimes referred to as “latex” paint, so look for the 100% acrylic part.

-- Our village hasn't lost it's idiot, he was elected to congress.

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DJ14

4 posts in 702 days


#2 posted 02-11-2015 04:54 PM

Thanks. So, just use a good exterior paint and call it good? And, yes, I was referring to exterior paints.

I’ve used Helmsman Spar Varnish on outdoor furniture before without any issues. Is it not a good idea to apply something like that over an “exterior” paint?

View Fred Hargis's profile

Fred Hargis

3947 posts in 1959 days


#3 posted 02-11-2015 05:16 PM

If you’ve used Helmsman outside without issues, you ma be one of 2-3 folks that have had success doing so. But there’s no real reason to top coat an exterior paint with anything else, by definition it’s made for that purpose. There is a real reason not to coat it with an oil based varnish (besides the varnish ultimately failing by peeling/flaking/cracking). It will yellow fairly quickly, and may have an immediate impact on the bright colors your customers want. So….yes, use the exterior paint and call it good.

-- Our village hasn't lost it's idiot, he was elected to congress.

View CharlesNeil's profile

CharlesNeil

1610 posts in 3336 days


#4 posted 02-11-2015 05:26 PM

I totally agree with Fred , good sound advice

View DJ14's profile

DJ14

4 posts in 702 days


#5 posted 02-11-2015 05:44 PM

I’ll sure heed the advice and it’s greatly appreciated!

Regarding the Helmsman, I’ve used it on a number of pieces without issues. Granted they have all been either natural or stained but other than reapplying every two years or so it has been great. What would you recommend using to seal natural or stained wood for outdoor applications?

View Fred Hargis's profile

Fred Hargis

3947 posts in 1959 days


#6 posted 02-11-2015 05:55 PM

Either a true marine spar varnish, or untinted oil based paint. But don’t let me or anyone talk you out of something that works for you. If you’re happy with the Helmsman, stay with it.

-- Our village hasn't lost it's idiot, he was elected to congress.

View DrDirt's profile

DrDirt

4169 posts in 3208 days


#7 posted 02-11-2015 06:52 PM

For an outdoor finish – NO clear coats beat exterior latex of outdoor acrylic paint.

For Varnished wood – you are refinishing every other year.

Think of how often you have to repaint your house. FWW tested outdoor finishes, and paint is #1 by HUGE margin. The pigment blocks all of the uv from the wood. So the UV blocker in the paint merely keeps the finish looking good.

Clearcoat will always be inferior for protection. Best they had in FWW #205 was Epifanes +epoxy basecoat.

-- 'Political correctness is fascism pretending to be manners' ~George Carlin

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pjones46

986 posts in 2109 days


#8 posted 02-12-2015 12:20 AM

Research using Sikkens colors. They can mix up really bright colors which are designed for exterior use.

-- Respectfully, Paul

View Faceman_'s profile

Faceman_

18 posts in 1142 days


#9 posted 02-22-2015 05:32 AM

Four coats of Helmsman covers two outdoor firewood racks of mine and they have been holding up fine after 4 years.

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