1. SURFACE TEMPERATURE (Ts) the temperature of the surface to be painted 2. AIR TEMPERATURE (Ta) the temperature of the air surrounding the surface to be painted 3. % RELATIVE HUMIDITY (RH) the amount of water vapor present in the air compared to the maximum possible expressed as a percentage 4. WET BULB TEMPERATURE (Twb) … Continue reading Preparing outdoor surfaces for painting – 7 crucial weather factors