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Re: Air temp to paint gun?
Air temp won't make any difference, so long as your product in the pot and metal temp is 70.
65 is a bigger issue. Room temp and metal temp need to be higher because 2K urethane need heat to cure. They don't dry, they cure. If metal temp is too low, they cool the urethane down to stall. When stalled from curing, they die and will dry, but not cure...even if warmed up later.
Metal temp is always cooler than room temp, and it's the most important one to measure. 65 can become 60 or less very easily so be very careful at 65 because you're at the low end of acceptable range. The TDS will surely tell you what the temp range is. Maybe the product you've chosen has a lower temp range?
I like your idea of test panels. Watch for solvent pop and thumb printing. The reducers are going to be slow to flash and the urethane may not completely cure.
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