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Chalk
Run-down: The washing down of chalk from an excessively
eroding paint onto another area below (a brick foundation,
for example), ruining its appearance.
Possible Cause:
Use of a lower quality, highly pigmented paint.
Use of an interior paint for an outdoor application.
Erosion of factory-finished metal siding.
Solution:
Remove as
much of the chalk residue as possible (see
Chalking). Scrub any stained areas with a stiff brush,
using a detergent solution; rinse thoroughly. In cases of
severe staining, an acid wash may be necessary. Either
way, if the affected area dries to a different color,
consider painting it with a quality latex paint. Eroding
aluminum siding should be thoroughly cleaned (power
washing recommended) before painting with a quality
exterior latex paint.
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