Again, I'm not a pro painter so this is hobby BS. Your reducers are usually available in a fast, medium and slow formulation.
This tells you how volatile they are and how quick they will evaporate out of the paint...how fast they will dry.
A fast reducer on a hot day won't let the paint flow properly and it would tend to orange peel, it dried too fast.
Your paint store folks will have suggestions based on local weather conditions. You wouldn't use a fast reducer at the "Hells Kitchen Body shop" and you wouldn't use a slow reducer at the "Nome Collision Repair Center"...make sense.
Stuart
