Mildew
 

Description:
Black, gray, green or brown areas on the surface of paint or caulk.

Possible Cause:
The appearance of mildew or algae depends on various conditions, which are:

• Continuously high humidity or dampness. As the humidity increases, mildew growth becomes more rapid.
• High average temperature.
• Poor ventilation. Still air increases mildew growth.
• Composition of surface. Mildew will grow on any surface that provides a nutrient, even dirt.
• Mildew occurs more often on light colors of paint film. Colors that do not absorb the suns heat provide a surface for mildew growth. Dark colors become hot and discourage mildew growth.
• Cement based products are more prone to support algae growth.

Solution:
Provide drainage and/or ventilation to remove excess moisture. Wash mildewed areas with a solution of one part household bleach and three parts water.* This will destroy mildew and bleach the stains caused by mildew (continued from previous page) growth. Apply solution by brush or a garden sprayer apparatus. Heavy mildew may require additional applications, and scrubbing may be required. Flush area with clean water to remove bleach solution. Allow to dry thoroughly. *Follow label cautions when using bleach solution.

Recommended System:
Primer
1 Coat of FLEX BON #109 Series Surface Conditioner "EPOXY BOND"
Topcoat
2 Coats of Top Quality FLEX BON Exterior Latex Paint