(Roy) wrote:

Cuprinol in some awfully good stuff. The green color preservative IIRC
is guaranteed against rot for 20 years if you just soak the luimber
with it first, but I have used it since the early 70's, in the green
color as well as their other colors and its super.

The green is 20% copper naphthenate and is recommended for greenhouse
uses. The other colors are other chemicals.

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