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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 co-efficient 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 historical homes.
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