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Exterior Paint Problem Solver
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Chalking
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Formation of fine powder on the surface of the paint film during weathering, which can cause color fading. Although some degree of chalking is a normal, desirable way for a paint film to wear, excessive film erosion can result in heavy chalking.
Possible Cause:
Use of low-grade, highly pigmented paint.
Use of an interior paint for an outdoor application.
Solution:
Remove as much of the chalk residue as possible, using a stiff bristle brush (or wire brush on masonry) and then rinse thoroughly with a garden hose. Use power washing equipment for large jobs.
Check for any remaining chalk by running a hand over the surface after it dries. If noticeable chalk is still present, apply a quality latex primer or chalk sealer.
Repaint with a high-quality latex house paint.
If little or no chalk is remaining and the old house paint is sound, no priming is necessary.
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