Just QEWed my car and added another layer of #16. Funny thing is, after almost 4 weeks, 4-5 days of rain, pollen, two washes using NXT Wash at the local coin op (and letting my car air dry), when I ran my hand down the side of my car after washing, the paint was still very slick. In fact, as I applied and removed the #16, the new layer was only marginally slicker than the nearly 4 week old application!