Painting the Exterior

I had a 2001 journey with same problem. My understanding is that the problem is the sidewall material and painting is a temporary fix as it will reoccur. Winnebago called it "sidewall checking". Others called it "sidewall etching". The fibers are working their way out of the wall material. Darker colors, more heat, causes it to happen faster. Most all manufacturer's had the same ptoblem. My Newmar product has had the sidewall material replaced. Can do that on a hung wall slide, cannot do on a vacubonded wall. Paint will fix for awhile but do not know for how long.