I'll add to this.
Last Monday I finally did my entire truck with BSG and was thrilled with the look. 6 days later and the shine is still as good as it was after applying it.
My truck gets sunlight from sunrise to sunset and I get dew on it overnight. I live close to the ocean and everynight it gets wet. It still holds, I dont have water marks from driving into work early in the morning. It just rolls off!
Def. a product to use more often now.