Chalking
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:
Solution:
First, remove as much as 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 oil-based or acrylic latex
primer (use a comparable sealer for masonry). Then repaint
with a quality exterior 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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