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Care of Polished Brass When Installed Outside
All
hardware which is exposed to the elements will ultimately
develop an impaired finish. Items such as door knockers,
letter box plates, or any hardware items mounted on outside
doors will eventually deteriorate. The period of time from
which the tarnishing will begin may vary from area to area,
depending on the local atmospheric conditions, clean air
standards, emission of pollutants from industry and other
commercial establishments. We have seen some items deteriorate
within a month while others, after three years of installation,
remain in excellent condition.
Products
which are exposed to sun deteriorate more quickly, since
ultraviolet rays eventually affect the finish. The coefficient
of expansion between the metal and its lacquer coating differs,
causing hardware products exposed to bright sunlight during
the day to expand to such an extent that the lacquer begins
to crack, exposing the metal surface to air, rain, and pollutants.
When
discoloration or deterioration of the finish occurs, we
recommend that the surface of the hardware product be fully
washed with warm, soapy water. This will loosen any debris
accumulated in the pores of the metal. Next, lightly scrub
the entire fixture using a soapy, fine metal scouring pad
in order to remove the additional loose particles of lacquer
that may be peeling from the hardware item. We also recommend
the use of "Scotch Bright" pads (a 3-M product), soaked
in light oil (3 in 1) as a method which is even more effective.
After scrubbing, the metal should appear smooth and bright
again. Wash the metal surface once more using warm, soapy
water and dry it thoroughly.
The
last step to preserve the finish will be to apply a light
coat of wax. If you do not have any, use clear shoe polish,
applying an even coat on the entire surface and then buffing
it, using a soft polishing cloth.
Your
metal product will now have a semi-glossy, yellow glow which
will be preserved for several months. When discoloration
recurs, repeat the process. It may take several years of
repeated applications of this waxing process before your
hardware will have the protective coating necessary to retain
its shine for a long period. As a matter of fact, the finish
will become more beautiful with the years, depending on
your polishing skill and zeal. The efforts are most rewarding
since the hardware will eventually have a very beautiful
appearance that resembles antique brass products, similar
to the hardware mounted on historic homes. |