I recently posed the optimum ambient temp question to Sal Zaino regarding the use of Z-2. Here's his response:
"Zaino Show car polish works best at 60 degrees or higher. However it can
be applied down to temperatures of 40 degrees. It just will take much, much
longer to dry. As much as two hours drying time is required if the
temperature is 50 degrees or below… I have applied Z-2 in the Arizona sun and
it dried in about 3 minutes. I have also applied it in 38 degree
temperature and it took about 2 to 3 hours to dry."
