I would guess you have a copy of the Technical Data Sheet for the single stage paint, if not, get one. Follow the recommended tip size for the HVLP gun you are using. Paint in the morning during the cooler temps, allow the rcommended flash time between coats. I dealt with similar weather conditions last year and had no problems. The AkzoNobel polyurethane single stage I used did not require a reducer. If yours does, be sure to follow the recommended reducer for the approximate temperature range for the environment you plan to spray the paint in. Reducers types are slow, medium, and fast. The type indicates has fast the solvents will evaporate and the paint flashes and starts to cure. I'm an amatuer but had good results with the single stage.
