As a result, hairline cracks form. Small openings in the paint allow rainwater to seep in, which ultimately results in flaking. The flaking paint should be scraped off and the surface smoothed by sanding. In cases of cracking the surface should be re-primed. Mildew - Mildew looks like dirt, but it won't wash off.
Consumers can test for mildew by putting a few drops of bleach on the area.
If discoloration disappears or is minimized after 30 seconds, it is mildew. To combat the problem, use a mildewcide product or mix a solution of one part bleach to three parts water and allow it to stand for 30 minutes. Then scrub the area with a scrub brush and rinse well, allowing the surface to dry before painting. Peeling - You can avoid paint peeling by preparing the surface properly and eliminating sources of moisture before painting. Peeling may be a result of paint having been applied under the wrong weather conditions, as indicated on the paint label.