Chalk Run-down paint
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 Causes chalk run-down paint
Use of a lower quality, highly pigmented paint.
Use of an interior paint for an outdoor application.
Erosion of factory-finished metal siding.
Solution chalk run-down paint
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.