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GPW wrote:MP ... 75% Mineral Spirits (common paint thinner ) and 25% Polyurethane varnish ... It's even OK to use the really cheap stuff ($5.00/gal) , because you want it to PENETRATE deep into the wood !!! Four or 5 really wet coats really seals the wood very well ...pay special attention (more coats ) to all end grain and any voids in the plywood ...
If I had my druthers (what's a druther?) I'd set up a big tank and soak all the cut out parts in it for a week ... Wood is like little tubes weakly glued together (like a handful of straws , probably same basic material ) Once you can fill the tubes or at least waterproof (plastic coat) them , water has no place to sink in (soak and rot)... as much ...
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You know you've put enough on when it won't soak in any more ...
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