I was looking at this product myself, I have asked someone who left negative feedback, also for a Fiat, as to why the product didnt work and will let you know of any response. The seller sends out a lot of product and if it produces better results than T cut it could be worth a try. Logically, it must work by moving some good paint across the scratched area, as does T cut.
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i have used this, and on smaller scratches it does work think iv still got some actually, and i used it down the whole side of a car which was badly key'd and its alot less visable now.