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OT: but does involve waterproofing wood with titebond III

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  • OT: but does involve waterproofing wood with titebond III

    I've got a wooden sign a friend painted for me to hang outdoors by the pool. It's not waterproofed and absorbs water - it won't last long with FL rains. I tried to coat a small section on the back and spar varnish will dissolve the paint, so that's out. Surely I could encapsulate with $60 worth of marine epoxy, but looking for a cheaper route. Could I coat it with Titebond III thinned with water? It dries pretty clear. Thoughts.

  • #2
    I wonder what kind of paint it has on it?

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    • #3
      Use an exterior water based urethane. Whatever brand comes in a small can but most likely Minwax at the box stores.

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      • #4
        Originally posted by Zephyr View Post
        Use an exterior water based urethane. Whatever brand comes in a small can but most likely Minwax at the box stores.
        This is what I'd do, too. Test a small area, and if compatible w/ the paint I'd spray the rest on.

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        • #5
          Maybe Helmsmen Spar poly (Minwax) sprayed from a can . It is solvent base but maybe spraying with light coats would not affect the paint.

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          • #6
            What type of wood? What type of paint?

            Have you thought of sealing it with shellac prior to exterior grade urethane?

            btw, test on scrap if possible.

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            • #7
              I've used General Finishes' Exterior 450 Water Based Topcoat with good results outdoors. I spray it, but it can be brushed. It has UV absorbers and mold-reducing mildewcide in the formula for outdoor usage..
              Bill Schneider
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              www.afterness.com/audio

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              • #8
                Spray on shellac then spray on polyurethane. Both should be around $10 each on Ama Zon.

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                • #9
                  Thanks all for the ideas. The sign was a gift so I don't know what kind of paint or finish was used. It looks like white pine. I think I'll try a water based urethane and test first on a small area.

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