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 from heavy chalking.
Possible Causes Chalking Paint
Use of a low-grade, highly pigmented paint.
Use of an interior paint for an outdoor application.
Solution Chalking Paint
First, remove as much of the chalk residue as possible, scrubbing with a stiff bristle brush (or wire brush
on masonry) and then rinse thoroughly; or use power washing equipment. Check for any remaining chalk by
running a hand over the surface after it dries. If noticeable chalk is still present, apply a quality oil-based or
acrylic latex primer (or comparable sealer for masonry), then repaint with a quality exterior coating; if little or
no chalk remains and the old paint is sound, no priming is