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 causes:

  • 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 colour, consider painting it with a quality latex paint. Eroding aluminium siding should be thoroughly cleaned (power washing recommended) before painting with a quality exterior latex paint.

Chalk Rundown
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