On Sunday, January 24, 2016 at 9:57:28 PM UTC-5, wrote:
Thanks for all the tips. I sprayed today 4 paint, 3 reducer (instead of two), 1 hardener. It was much better! Im spraying in an I heated hanger, 60-65 degrees. But the extra reducer got the viscosity low enough to make the spraying work well.

you should be fine with 4:2:1 using concept. make sure the air pressure is set right and that your gun is in good working condition. you CAN add more reducer, or use a higher temp reducer. you could try reducing with DT 885 on your paint job. 885 is slow which is good for minimizing orange peel, just make sure you wait between coats. 870 just doesn't flow as nice in my experience, even when the room is "cold".