Causes: - Usually forms in protected areas not receiving cleaning rains - Dark colors over paint or primer using excessive extender pigments - Mistaken for efflorescence Solutions: - Remove frosting with a wire brush on masonry and sanding on wood - Rinse thoroughly with a garden hose - For best and quickest results use a power washer - Frosting often will bleed through new paint if an alkyd -based primer isn't used (an alkyd primer is essential to avoid reoccurence of bleeding through the new finish coat only) |