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Old 11-20-2011, 02:56 PM   #1
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some sort of protection over exterior paint?


i am making a sandwich board from some leftover plywood that is going to be outside on the sidewalk, exposed to the weather, during business hours. i like the look of the woodgrain so i only want to paint the words and logos but then weatherize the entire thing. that is the best way to achieve that?

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Old 11-20-2011, 06:04 PM   #2
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some sort of protection over exterior paint?


There are plenty of clear coatings you can use on bare wood. Check with your local paintstore for info. Avoid anything cheap like Thompson's Water Seal. As for the painted parts, not much that really foots the bill. The exterior paint is a waterproof coating in and of itself. As long as it's a vertical surface, you should get many years out of your painted/waterproofed sign.

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Old 11-21-2011, 09:51 AM   #3
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some sort of protection over exterior paint?


Make sure you use a clear sealer/primer before anything else. Try to get paints and clear coats with lots of UV protection. Your autobody shop might clear coat it for you cheaper than you buying finish. You can paste wax the clear coat.

Definitely stay clear of Thompson's for the sealer. It has wax in it and your paint will not stick.
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Old 11-21-2011, 10:20 AM   #4
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some sort of protection over exterior paint?


Put a thinned coat of a Spar varnish on it, lightly sand- do your lettering, then finish with a coat or two more of the spar.
It is an oil finish- so be aware that it will amber- more over time.
This will change your lettering colors a bit too- blues will look greenish, etc. But it will hold up the best.
It will bring out the wood tones very nice.
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Old 11-21-2011, 04:10 PM   #5
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some sort of protection over exterior paint?


A 50/50 mix of mineral spirits and processed (not raw) lindseed oil is a tried and true old-fashioned wood sealer. It too will discolor a bit and you will have to wait it out to dry a bit.
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