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Main paint problem list

Exterior problem
Chalk Run-down

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 (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 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.