I have a 2002 Eclipse and the passenger rocker panel has a weld that is starting to rust. Normally I would just treat it with POR-15 but over the weekend I happened to see my old 2006 Mazda 6 that I sold in 2012. That car had a bad pinch weld on the passenger rear wheel well and dogleg that I had touched up with POR 15 in the spring of 2012. 2 years later the whole wheel arch and dogleg was a rusty mess with a hole about the size of a golf ball in the dogleg. Does trying to treat the rust cause it to accelrate? We had 1 mild winter and 1 severe winter between Spring 2012 and now. I dont want to treat the rust on the Mitsubishi if I am only going to accelrate it into a major body rot issue in the near future. Has anyone had a similar experience? I completed the 3 step clean, prep, paint process with the POR-15 on the Mazda and then top coated the POR-15 with black automotive paint.