Todd wrote

> FWIW - for above ground use, zinc napthenate is more paint friendly, and
less toxic.

Remember that if you use zinc naphthenate instead of copper naphthenate as
the preservative you need twice the concentration of zinc naphthenate.  For
example here in Australia we use 1% copper for treatment of bee hive
components.  For zinc naphthenate you need 2%.  This is because zinc is not
as good a fungicide as copper.

Trevor Weatherhead
AUSTRALIA

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