- Q.I build deck railings,
awning frames, and other structures out of welded,
galvanized steel tubing. I can’t get paint to
stick for very long. So far I have only tried Rustoleum
after using a mild acid rinse. It lasted about two
years before the paint started to peel. Is there a
product or technique that will last longer?
A.James Benney
responds: Yes! Following proper preparation
and application of the right product under the
right conditions, the paint should never peel, but
should provide many years of service before it
simply wears away or oxidizes enough to warrant
redoing.
We wipe down all new galvanized metal with a rag
or sponge saturated with pure white vinegar
(that’s your acid rinse), then we rinse
thoroughly with clear, clean water and let it dry.
This is to remove slick manufacturing residues that
will prevent your paint product from adhering to
the metal. You have to treat all surfaces, because
you will have problems with any areas you miss.
Under warm, dry conditions (this is important!),
there are many paint products that can now be
applied directly to the metal, including most
high-end latex paints. Often on gutters and
downspouts, we will use our latex or oil trim color
as a first and second coat. On railings and awning
frames we recommend Benjamin Moore’s
IronClad Retardo as both a primer and finish paint
because of its unusual durability and its soft,
low-luster finish. Whether brushing or spraying,
make sure you cover it with a nice full coat on
each application. You might be surprised how long
it lasts.
James Benney, of Paintcraft
Associates, is a painting contractor in Orinda,
Calif.