I do not know the exact the temp., but I have rolled/tipped in the summer with no problem. It would have been 90 degrees at least. It probably not ideal, i would at least keep the paint cool prior to application
Thanks for the input guys. This morning I went out to the barn to check on some fairing I did last night and it occured to me that morning is the best time to do it. Just get up about 5 and get after it. There's no wind, bugs, or much heat--about 65 this morning.