ZRC is apparently the leading "Cold Galvanizing " product, advertised as
being accepted by the US Government as "equivalent" to hot dip galvanizing."
(Inability to apply to the interior surface in tubing is a disadvantage
compared
to hot dip.) I have used ZRC several times over the last nine years with
positive results. One would prefer hot dip galvanizing, but there are
situations
when that is not practical. ZRC may also be useful to add protection to
galvanized steel. When hot dip is not practical, ZRC may be a useful
alternative,
probably more desirable than Rustolium or other paint products. I am no
expert, so do your own research.
Jack Hammett, K4VV
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