I am just a DIY painter, but I have been told this by more than one person and found it to be very true. My Trans Am is 40-50% flexible parts and I was planning on using this until I was told it wasn't necessary. After several years of driving and many rocks, bugs, etc. hitting my front bumper, there might be 3 or 4 tiny little nicks. It has held up very well, and I'm glad I didn't waste my money. Also, I have used Ohio Auto Kolor out in Newark for several years, and they are great people to deal with. They're always willing to answer any questions and they know what they're talking about.