Frank,

The product is actualy spelled Cop-R-Tox.  It is penetrating liquid copper.
The active ingredient is copper naphthenate 20%.  It is manufactured by
Mobile Paint MFG. Co., Inc., Theodore, Alabama 36590.

It is recommended as the initial treatment for new unpainted wood by Dadant &
Son, Inc., Hamilton, IL.  Their websit is, www.dadant.com.

After the Cop-R-Tox has dried for 25 hours you can apply latex directly and
avoid the oil based paint set.  Many high grade exterior paints suggest that
you apply their oil based primer before applying the latex.

Richard