acid rain and catchment thread

[randomq]

I went to clean the remaining Pele's hair from my gutters, and noticed that on the last half-inch of my relatively new HPM P7 roofing, the tops of the dips are bubbling up, as if there is rust under the paint. No scratches and just the factory edge on the roofing, so I am a little bummed about it. Not sure if this is acid rain related, or the factory edges need some touching up...