So you just finished putting that first coat of paint on that car that you have been restoring and it looks great. You didn't realize that you had to the talent to spray paint a car. The only problem is you have run out of time and can't get the second coat on. Well that's really not going to be a problem, the cars in a protected area so you can get back at it next week. You just stick the caps on the spray cans and stick them on the shelf for the time being.