F11 top coat states their product last 3-6 months on the average, depending on conditions. McGuire’s is way more cost effective.....
Here is a copy from facebook to a longevity question.
F11 lasts 3-6 months on average!
The longevity of the coating depends on how much abuse it takes from physical wear from car washes, hand washes, harsh chemicals, detergents, abusive weather or environmental conditions etc.