POSSIBLE CAUSES:
Fungus forms most often on areas that tend to be damp, and receive little or no direct sunlight (north facing walls and the underside of eaves are particularly vulnerable). Algae forms in the presence of light and moist environments.
Use of a lower quality paint, which may have an insufficient amount of fungicide or algicide.
Painting over a substrate or coating on which fungus or algae has not been removed.
SOLUTION:
Test to distinguish fungus or algae from dirt by applying a few drops of Sandtex Trade Fungicidal Solution to the discoloured area. If it disappears, it is probably fungus or algae.
Treat the contamination with Sandtex Trade Fungicidal Solution and leave on for 20 minutes, applying more as it dries. Wear goggles and rubber gloves. Then scrub and rinse the area with a stiff bristle brush.
In severe instances a second application of Sandtex Trade Fungicidal Solution may be needed.
