Ok, so we have this place up north that we sided this past summer. As I was installing the siding, we'd paint it so we wouldn't have to edge as much. For this reason, the painting occurred over 2 months time. Temps varied from the 70's to the 40's by the time we had finished. Paint was rolled on with two coats using a small diameter frameless roller, the corners were edged using brushes. Without naming a brand, I will say that it's a very high quality self priming latex flat made by a major manufacturer. The siding is the discontinued Certainteed cement board.
Almost immediately after painting the first wall I noticed problems with the finish. The areas that were exposed to rain had formed streaks and white spots that looked like hard water drops. I touched up these spots only to have them reappear after the next rain. The problem is not isolated to just one wall, as all the other walls are showing the same issue. This being a seasonal cabin, I haven't been up there for a couple of months. When I saw it last weekend, I was surprised by how bad the finish was looking. It was almost as if the paint was washing right off the wall! Two months later and the color of the screw heads was already showing through. At this pace, I'll have cement board showing by mid summer.
Conversations with the local paint rep was fruitless. I turned to corporate and they gladly comp'ed me 5 gallons of paint, but I still don't know why the finish failed in the first place. It's now pretty obvious that I'll be repainting the house, but I want to know what went wrong the first time so the mistake isn't repeated. Did I do something wrong? If the surface is failing, can I paint over it? Do I need to strip, pressure wash or wash with TSP?
Wish I could post pictures, but after an hour of trying, I can't get the file size or image size to be compatible with the site's requirements.