Thanks again Pinder
Even though its 49 degrees out it looks like I can get the metal temp up to 70 degress now using three heaters including a small one in the booth. Standox quotes its dry time at 68 degrees so I am shooting for 68 to 70. I finished my booth enough to test today and its currently blowing more air in than it sucks out, which meants it forces overspray out the cracks towards the heaters and possibly leaves too much overspray inside the booth to leave lights inside. I am adding a large floor fan to the exhaust tomorrow to hopefully get an even flow. If I was painting in warm weather with the barn doors open I wouldn't care about overspray being pushed out the cracks. Now I am less worried about the dust in the booth and more concerned about overspray outside the booth requiring me to keep the heat off while spraying.
Buffing through more than a coat of the clear should not leave any rings, but I will definately have rings if I buff down to the thin metalic base coats. Hense the reason for going with four quarts of clear. I buffed enough clear over color coats back in the days of laquer to know the risk of buffing to far. I won't sand the edges, just up to them, and my buffer is a professional orbital model that stops spinning if you put pressure on a corner. I just know though that I can make mistakes not haveing done this for thirty years, and I don't want any chance of having to touch up the color now or later.
I also did find out that is recommended to add hardner to the paint used in the engine bay for durability purposes. The correct PPG paint for the trunk also uses hardner for the same purpose.
I didn't know before that the flash times between clear coats affects long-time adhesion. I need to call dupont on that as I may need to leave the heaters off too long betwen coats for that.
I guess I could always consder the water base option?