I've not had any negative effects of the coatings mentioned. Do you drive in the winter crud? So far the modesta has been great, I like how easy it is to clean off the winter grime.
IN my experience with the two coatings Modesta turned the product applicator MUCH harder than any other coating I've every used. Modesta is MUCH more time consuming to apply properly, and you should use the paint prep before the coating, this is 300+$ just in product to apply to a car. So I have to question if your guy can really apply, properly prep, and paint correct for the price you mentioned above. I think most people will be great applying CQF and have years of happy results. The gloss of CQF is stunning, the preformance is outstanding. With ALL coatings their is still some yearly or biyearly processes to clean and maintain the coatings…..these are, not in my opinion, slap them on and forget them for years.
Cheers,
GREG