I did mine over the weekend, used VHT.
Pulled lenses, washed them, prepped with alcohol and let dry. It was about 90* while i was doing this. After they were dry, i masked everything that wasn't the lens and the inner section of the center pieces. I did 5 light coats all while they were sitting in direct sunlight. Results were perfect.
It really is about the prep, it took me over 90 minutes just to get them ready to spray.