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Old 04-19-2010, 08:41 AM   #1
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Is it worth it to spar urethane over flat exterior latex paint?


I've got a small exterior wall, plywood surface that's been primed and painted with flat exterior latex. If I want to give this more protection from the elements (water, sun, freezing) should I coat with a spar urethane or would it be better to just build up extra coats of the same exterior grade latex?

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Old 04-19-2010, 07:48 PM   #2
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Is it worth it to spar urethane over flat exterior latex paint?


The spar urethane could actually peel and bubble the latex underneath. If you have a solid coat of paint on the wood, I would say you are protected.

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Old 04-20-2010, 02:45 PM   #3
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Is it worth it to spar urethane over flat exterior latex paint?


Matthew:

At another DIY forum, someone suggested the same to me. He said that the flat exterior was a bad idea if I was looking for the surface to be water repellent. He said better to go with a satin or semi-gloss, which I just painted over the flat. He said this would give just as much protection as a spar urethane. Hard to believe, but we'll see. Thanks for your reply.
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Old 04-21-2010, 09:15 PM   #4
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Is it worth it to spar urethane over flat exterior latex paint?


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Originally Posted by peterk312 View Post
should I coat with a spar urethane
Only if you enjoy sanding off coats of varnish every two years.
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