This is exactly my preferred winter protection. I applied the Z2/Z5 in August 2007 and it was still slick and beading when I applied a single coat of 845IW in October 2007. Now it's March 2008 and the 845 is still glossy, slick and beading. Even though we've had 50+ inches of snow this winter, I have had no issues with bonding or durability. Just for some extra protection I use Megs Ultimate QD after washes. It is a fantastic combination for the Chicago winters.