I've used touch up paint in two areas: 1) the lower side of the door where my friend opened it and hit a high curb 2) underneth the right corner of the front bumper where I scraped on a curb. Both jobs blended in well only because it's in areas that are low and hard to see in the first place. I've yet to try them on any of my 2-3 paint chips, but after reading this, I am even more hesitant.