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Old 08-23-2011, 08:41 AM
  #8  
dakotamaid
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Join Date: Feb 2009
Location: South central Nebraska, US
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outdoor plywood, treated or marine. I also would seal it good before and after painting with out door paint. The one my sil made also has a frame that seals in the plywood edges, she glued and nailed it to keep out the moisture.
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