Already coated exterior ply with Thomsons water seal Can I coat over it with Valspar Spar Varnish?
Edited 7/14/2003 6:01:55 AM ET by steinmetz
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Edited 7/14/2003 6:01:55 AM ET by steinmetz
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Yes, the key is to get the edges sealed well. Exterior plywood is made with waterproof adhesive but the wood itself is generally not a good outdoor wood. The wood will rot even though the adhesive will not fail.
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