I contacted PPG by e-mail because a phone number was not provided for this product line. My question was very specific, "What are the minimum and maximum air and surface temperatures recommended during spray applications"?
Their answer was, "All PPG products are tested at 70F".
Of course, this doesn't answer my question. I still don't know if 60F or 80F will yield acceptable results. Next stop is to ask the guys who sold me the paint. Maybe they know.