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The "teflon" that the dealer is putting on your car is actually PPS Teflon, a.k.a PPS/PTFE coating. They simply refer to it as teflon because they want you to think it's the hard ass material that they coat your fry pan, which is not exactly the same. You can think of it as a much "milder" version on your car. It's mostly just an indication that the coating has a low coefficient of friction. Most wax/sealant that you put on actually attract more dirt in the summer, where as PPS Teflon doesn't attract as much. You'll find it's easier to wash off bug tar on a car that has PPS Teflon coating than cars with regular sealant. It simply means it's a slippery-er coating.
Two years ago i tried this product called "5 star shine", which is a PPS Teflon paint protection for cars. They claim it lasts up to 5 years, but it doesn't. HOWEVER, it does last longer than normal sealant, and it's more slippery. In my experience it lasts about a year or so. I've applied sealant and wax on my cars before. You can feel when you get normal car sealant on your hands, it can be washed off with soap right away. I applied PPS Teflon on my car, i got those on my hands, and i could still feel the "weirdness" on my hands for 2 days with regular hand washing.
PPS Teflon is something that lasts longer than regular sealant, but personally I wouldn't apply it again because I don't think the value justifies the cost. After i got my BRZ i read many great reviews about Opti-coat so i got that done instead.
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