Teflon based coating products... well, theres a lot of talk about them and i tell u why.
Cheap to manufacture, very easy to apply! So it means a lot of room for profits! They do give the car some good deep wet gloss and they are good on touch! Washing & maintaining vehicle is much easier too. Means after coating when the customer touches his car, he can feel it be very slick n soft! Hence car dealerships love to offer these products as an option to their customers... any average idiot worker of their's can quickly apply it n buff off! Hence the companies that are make these coatings are actually big... they are offering these to car showrooms directly and making huge sales and profits. Dealerships love em too, coz theres nothing technical on it.. just an easy steal of money...
It is the reason u hear a lot of negatives about them online forums... they over promise, under deliver because:
A) Already an inferior product(less resistant to swirls & scratches)
B) Dealer applied means, improper hastey application
Moreover Teflon based coatings have good water sheeting behaviour and cars do stay cleaner for longer, washing them is easier too. Gloss good too.
Now lets come to explaining the negatives...
Its a very thin coat and wont provide much scratch resistance, it gets a lot of swirls back on it quickly, its not exactly as durable as advertised and cannot be taken as a substitute to proper paint coating/glass coating!
Proper paint coatings/ glass coatings are much better in terms of real protection then these Teflon based ones.
So if u want optimum protection, go for a quality paint coating!