My only understanding of this product is that it reduces swirl marks which can appear after a polish. However improper washing after application will still result in swirling
Along with protecting the paint from minor scratching. But not stone chips etc
As for is it permanent . Yes well as permanent as the paint
Anything already on the paint before application would get trapped under. I’m not sure of the environment it’s applied in but any moisture could potentially be trapped under the coating
I’ve not seen anything in regards to scratches or marks I would presume a new coat would need to be applied to the area
Personally I think it’s just another way if the dealer getting more money out of a buyer. Only plus side is easy washing and no polishing really required
Would it be as good as a really good clean by hand . Probably not but how many people want to spend several hours cleaning their cars ? Well apart from most members on this forum
Cannot answer all the questions but that’s my insight into the products
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