I applied 1 coat 3 months ago to my 300. I'd say it's still beading pretty good, considering it gets parked outside 24/7.
*Curious what the difference is between the TW ICE Spray Wax and the TW Seal & Shine ?I just decided to go with TWSNS.
After finishing up applying Meguiar's Ultimate Liquid Wax, this Turtle Wax stuff is going to be hard to beat, because of ease of use and results.
I used to like TW Ice Spray Wax for the same reasons, and the feedback here is quite positive...not nmuch convincing needed in my case.