U.S. 8,202,581 B2
Valspar Sourcing, Inc. has been granted a patent for a method for preparing a coated article comprised of providing a cement fiberboard substrate having an outer surface, applying directly to the cement fiberboard substrate an aqueous treatment comprised of at least one phosphorus acid or salt of a phosphorus acid, and applying atop at least the treated substrate one or more of a sealer, primer or topcoat.
Source:
http://www.coatingsworld.com/issues/2013-03/view_patents/valspar-patents-treatment-for-cement-composite/
