Frosting probable causes - usually forms in protected areas not receiving cleaning rains. Dark colors over paint or primer using excessive extender pigments. Mistaken for efflorescence.
Frosting 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 will often bleed through new paint if an alkyd-based primer isn't used.
Primers and exterior finishes - Priming is essential for better adhesion, sheen uniformity, mildew control and durability. Ask your Muralo dealer for the best Muralo exterior paint for your project, in the color and sheen of your choice.