The cost differs from car to car & provider. The warranty in some cases also comes with 2 subsequent free coating (within 1 year's time).
Teflon coating, to my understanding, helps retain the original colour & shine of the car, and also avoids very minor scratches from penetrating onto the original surface. Therefore, if one desires to go for it, he should go immediately after buying the car - so as to get the optimum benefit of it.
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