Premature and/or excessive lightening of the paint colour can occur on surfaces that are regularly exposed to the sun. Fading, or poor colour retention, can also be caused by chalking.
- Using an interior paint for an outdoor application.
- Using a lower-quality paint, leading to rapid degradation (chalking) of the paint film.
- Using a paint colour that is particularly vulnerable to UV-radiation (certain bright reds, blues, and yellows, for example).
- Tinting a white paint not intended for tinting, or over-tinting a light or medium paint base.
If fading or poor colour retention is a result of chalking, remove as much of the chalk as possible by scrubbing the surface with a stiff bristle brush (or a wire brush for masonry), and rinsing thoroughly.
Check for any remaining chalk by running a hand over the surface after it has dried. If a noticeable amount of chalk is still present, apply a quality solvent-based or acrylic water-based primer (or comparable sealer for masonry), then repaint the surface with a quality exterior coating. If little or no chalk remains and the old paint is sound, no priming is necessary.
When repainting the surface, be sure to use a quality exterior house paint in colours that are recommended for exterior use.