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Old 05-28-2012, 02:26 PM   #1
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exterior oil-based polyurethane over exterior latex paint?


hello!

I have recently hand painted some signs for a business. They will be outside and exposed to all elements. The paint is an exterior latex, on top of that I used an oil-based exterior polyurethane. I now hear this might be a problem - that the paint might peel. If so, what is the best way to protect these signs from the elements?

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Old 05-28-2012, 03:11 PM   #2
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exterior oil-based polyurethane over exterior latex paint?


It's the poly that's going to start peeling first.
Should have use enamel sign paint and no sealer would be needed.

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Old 05-28-2012, 03:11 PM   #3
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exterior oil-based polyurethane over exterior latex paint?


Who said the paint will peal? What I would think would happen is that the poly will amber and change the color of your lettering, and that when the weather does get to it ( in a year or two-) it will be the varnish that shows it.
If you painted it with exterior paints- you should have left it with them. Easier to touch up.
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Old 05-28-2012, 03:12 PM   #4
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exterior oil-based polyurethane over exterior latex paint?


You really only need to post once.
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Old 05-29-2012, 04:04 PM   #5
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exterior oil-based polyurethane over exterior latex paint?


Exterior latex paint does not need a clear coat, let alone a solvent based brittle finish. The only alkyd products with actual UV resistance are spar varnish, but they are generally used over stained doors or trim, not latex paints.
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Old 05-29-2012, 05:37 PM   #6
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exterior oil-based polyurethane over exterior latex paint?


The best way to keep it from the elements is to put it on an easel behind a window.

The net time you do a sign, do not use an oil-based polyurethane or alkyd varnish. Thse are amber and affect the coloring of the sign/letters. They continue to amber with age. I do not recommend clears over quality paint. There are too many problems that can arise requiring stripping and starting anew.

For now, what's done is done; let nature take its course.

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