Quote Originally Posted by Captdon View Post
You also have to power wash the siding. Then you have to a have a cool, non-humid couple of day for the painting and the drying. Too much heat will cause the paint to dry out before setting. Humidity will keep the paint from truly curing. This applies to any outdoor painting.
Yes, when aluminum siding ages, it develops a powdery finish. That has to be entirely removed, along with all traces of mold and mildew that may be lurking in the recesses. Power washing is the best way to remove both. Humidity is always a factor in painting.