I'm hoping to wash and wax my car this weekend, before the weather starts to get bitterly cold around here. My question is, how long do the spray on waxes generally last? I have some Lucas slick mist I want to use,but wondered if one application will last until spring? I bought my scion used in mid June and unfortunately haven't had a chance to wash our wax it so far, so that's why i'm itching to get it fine before winter really hits, as I won't have time or the warm weather to do it until spring and I was thinking of trying the spray on wax to save some time. I do have done meguires nxt gen if you guys recommend something other than a spray wax. Thanks