I knew that System One X3 works great under sun as I often use it because of that ability, I rent so I don't have garage to work in nor much of a shade, and I live in Southern California.
But I never knew it's full potential until I saw video below. Guy is detailing black car whose paint's temperature is 155 degrees in full sun as if it is nothing! I can not see any signs of dust nor gumming up (at least not visible ones) even when I watch in high resolution! Check it out, it is incredible, it seems like a God send to us tree shade detailers: