You'll want the cans to be at or above 70* to get a good spray(keep in bucket of hot water to maintan can temps), alternate cans too. Use one for no more than 2 minutes, then swap. Be sure to clean nozel often. Stay at the same distance away from the object your spraying. I played with a couple cans before doing my hood and roof. I found that just by altering the distance I sprayed, I could make a gloss or textured look. I plan to add a textured look/feel to my roof where some of my gear sits.