A fine powder can occur on the surface of the paint film during weathering, which can cause color fading.
What Causes It?
- Although some degree of chalking is a normal, desirable way for a paint film to wear, excessive film erosion can result in heavy chalking.
- The use of a lower-quality, highly pigmented paint or an interior paint can cause the paint to erode prematurely and cause chalking.
How to Solve It
- First, 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; 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).
- Repaint with a quality exterior coating. If little or no chalk remains and the old paint is sound, no priming is necessary.