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First, plywood is not a good medium for an outdoor sign because it tends to swell and the plies separate when exposed to moisture. Ideally, the application of a heavy coat of exterior primer before applying the paint would have helped your sign to better stand up to the elements.

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11y ago
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12y ago

I'm trying to figure the same thing out right now. I did read online that clear marine varnish is what to use so I'm going to start there!

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Q: How do you properly seal an outdoor plywood sign painted with oil based paint?
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