Ok, try to answer this. My 845 only lasted a week. The car got dirty due to rain once, i washed it once, and i washed it today again and its fockin not beading as it used to.
Did you properly clean your paint before applying it? If you previously were using a silicone fortified cheap "wax" the collinite might not want to bond with the paint. So you may have to wash clay, polish then wax with collinite.
you must have done something wrong in either the prep or the wash?
Did you prep properly as suggested above, and what shampoo did you use? Some shampoos leave stuff behind - aka wash/wax - and the stuff that is left behind affects the beading. It ddoesnt necessarily mean the wax underneath is gone...
I have used this a few times and my neighbours old beater has had it on for weeks of abuse and I still see it bead and sheet like a champ every time it rains