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I've used it, it works well for small chips/blemishes. Just follow the instructions, and be patient because it might take more than one application to build up the repair.
I bought the Dr. Color Chip product for my Daytona Orange '15 and I didn't have great success. On a couple of tiny chips it was ok but I had one chip about the width of pencil lead and 1/8" long and the paint just kept coming out of the chip. I contacted them and they told me to leave it longer. I left if overnight!! Still the same issue. I tried cleaning the chip with alcohol first and trying again but it still wouldn't stay in the chip.
I have use Dr. Color Chip on all my cars for years.
I will tell you that the results are based on the size and location of the chip. On a scale of 1 to 10, on small chips its a 9. On large chips its a 5.
The one thing I will say is that their color match is excellent. Even their metallics are a good color match. Some chips will take as much as ten applications to get them to fill in. Just be patient and let each application dry for hours before you do it again.
I tried it on my red C4 and the color match was good but I could never get the application process down. I ended up using Dr Colorchip paint and the Langka repair kit to smooth the paint blobs down. That worked great and I ended up repairing 20 chips on the hood with very good results. As in everything practice and patience makes perfect (or close to it).
Its good. Be sure to try it out on the most inconspicuous chip you can. I tried along the bottom area of the rockers. You will usually find a chip there to practice on.