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 | | | | DEFINITION
Frosting appears as white, salt-like substance on the paint surface. Although frosting can appear on any color, it is most visible on darker colors. When it occurs on masonry it is sometimes mistaken for efflorescence.
PROGRESSION
It usually forms as areas protected from the cleansing action of rain, dew and other moisture (such as, open porch ceilings and under eaves).
Frosting is a stubborn problem because it cannot easily be removed with water. In addition, frosting can recur and bleed through a new topcoat of paint. In extreme cases, it can even interfere with adhesion.
CAUSES
- Using dark colored paints that have been formulated with calcium carbonate extender pigments.
- Applying a dark colored paint over a primer containing calcium carbonate extender pigments.
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| FIXING PROBLEM | | DUNN-EDWARDS SOLUTIONS | | | | | Use the appropriate tool to remove the frosting, a wire brush on masonry surfaces and sandpaper for wood substrates. | | | | | | | Rinse the surface thoroughly with water and allow it to dry completely. | | | | | | | Apply an appropriate Dunn-Edwards alkyd-based primer. | | | | | | | Apply two coats of a Dunn-Edwards top-quality exterior paint. | |
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