This refers to the accumulation of dirt, dust particles and/or other debris on the paint film that may resemble fungus or algae.
- Using a low-quality paint, particularly lower grades of satin types.
- Air pollution, car exhaust fumes, and flying dust.
Wash off all surface dirt before priming and painting, using a scrub brush and detergent solution, followed by a thorough rinse. Heavier dirt accumulations may require the use of a power washer. While dirt pickup can't be eliminated entirely, top quality exterior water-based paints typically offer superior dirt pickup resistance and washability. Also, higher gloss paints are more resistant to dirt pickup than matt paints, which are more porous and can more easily entrap dirt. Regular wash down will give longevity to the paint film.
Remove all dirt from the surface using a scrubbing brush and a detergent solution, and rinse thoroughly. A heavy accumulation of dirt may require the use of a power-washer.
Prime and repaint the surface using a top-quality exterior water-based paint. While this type of paint will not entirely eliminate the accumulation of dirt, it typically offers superior resistance against dirt pickup, as well as greater washability. Higher-gloss paints are more resistant to dirt pickup than matt paints, which are porous and trap dirt more easily.
Wash the surface down regularly to improve the longevity of the paint film.