I went about 27 weeks before i used some QD+ on the hood...the Tahoe sits outside 24/7 and gets very little maintenence...once in a while I'll use Spray and Wipe to clean it up and ..there is still beading in and after it rains, but of couse not the same as initial application. Is it still there 8+ months later...I say yes because i know what my neighbors truck looks like in the rain(no beading at all) and he does no maintenence to his truck, and my truck still is fairly slick after just a quick S & W...