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Exterior Paint Problem Solver
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Chalk Run-down
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The washing down of chalk from an excessively eroding paint onto another area below (a brick foundation, for example) ruining its appearance (see chalking).
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 an all-purpose cleaner solution, and rinse thoroughly. In cases of staining, an acid wash may be necessary.
Either way, if the affected area dries to a different color, consider painting it with a quality exterior latex paint.
Eroding aluminum siding should be thoroughly washed (power washing recommended) before painting with exterior aluminum siding paint.
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