Teflon is completely different than 3M Paint Protection treatment. Teflon is a trademark/ brand of DuPont & is not in Tata-Fiat recommended brands. 3M Paint Protection is recommended by Tata (& hence by default Tata-Fiat) & are approved to give their service from Tata-Fiat Authorised Service stations. The billing is done by TASC. Now, when any TASC refuses to do 3M paint protection due to void of warranty on Fiat cars & still you go & do it overruling the TASC advice, then its understandable. The same are 2 cases mentioned above where they've refused. But, when you ask that you want to go for this approved treatment advocated at their TASC & still if they do not tell you that it causes warranty to void & do not refuse to do the treatment & instead they get the treatment done & give you a Tata Authorised Service Station bill, then its pretty obvious that it must not affect warranty in anywhich way. Heck, we're talking about Authorised Service Stations & not roadside garragewallahs misleading customers.