Quote Originally Posted by nivraarvin View Post
KSG lasts 6 months for me, and I wash everytime my car gets dirty. I get bored though and reapply it way before 6 months.
That's exactly why it's hard to judge "how long" will X product last. The variables differ a lot. If KSG lasts bi-annually for everybody, Big Berts won't be offering it on their quarterly paint protection program to save on costs.

Opti-coat's a great product, don't get me wrong there. However, the question is whether it fits your needs or not. In my case, it doesn't because it's uncompetitive on price-durability versus well-regarded "long life" waxes and sealants.