reviving an older thread (after searching) because after posting in another thread about this product, i wanted to let people know that dr. colorchip is one of my very highly recommended and favorite products. it isn't cheap as far as touch up paint goes, but if you are really anal about your paint, it's a hell of a lot cheaper than doing a full respray, and you should know this product does do exactly what it says it will do. does not leave that "blob" of paint that normal touch up products do. just blends in smooth and the rock chips literally disappear.
if you really don't care about chips and scratches to your paint, then i would not waste my time, or $, with this product, it's not for you. a little bottle of regular touch up will probably suit you fine.
as far as i can tell, the secret to the product is this chemical that you wipe on after painting the chip. after applying the paint to the chip with a small paintbrush or q-tip, you then "smear" the touch up spot you just painted with a rubber - gloved finger (glove is provided). this flattens out the "blob" but also spreads some touch up paint on your undamaged factory paint. You then wait a few minutes, and apply this liquid chemical (love to know exactly what it is, as this is the whole secret to their process) to a small wipe, and run it over the repair, including the area around the chip which has the excess paint. it removes the residual paint from your factory paint (but somehow not from the chip), and further smooths out the repair paint in the chip. the chip really blends in well to your factory paint job. while you may know the repair is there, from a few feet away the chip is extremely difficult to identify.
now there have been a few larger chip repairs (like 3/8") where i could still tell a repair had been made, it wasn't perfect, but you have to be realistic as to the size of the repair. they explain this in the directions. this product works really well on smaller chips. also, while the paint they make for you is an exact match to your factory paint, it also won't work as well on deep long scratches - and they also tell you this right up front. does it still work? yes, it does, but it looks like a normal touch up repair, the scratch doesn't "disappear" like it does with the small rock chips. which isn't a bad thing, just don't think those deep scratches or gouges are going to disappear like the chips do.
a word of caution. one of the things i found difficult was repairing numerous little rock chips at one time - because i was in a hurry. on the front painted grill of my jeep, i probably had 30 or so chips which had accumulated over several years. you certainly can hit them all at once, and then wait a few minutes for them to "dry" before applying the chemical wipe (iirc you can wait an hour or even two after painting the chips, to apply the chemical), the problem arises in REMEMBERING where each little repair chip was made. sometimes they disappear after you "smear" them. this happened to me on the hood of my Excursion, and the next day after a few chips had dried, i could see the "smear" marks that i had failed to wipe with the chemical the afternoon before. they didn't look so good. i could no longer wipe them as they had fully dried. that always bothered me. from now on, i do one chip at a time.
also, let's say your bumper is absolutely peppered with rock chips? i would not waste my time with dr. colorchip. i would respray instead. i never would have attempted this myself, until i began watching that show "Wheeler Dealers." that guy does amazing repairs using a rattle can.
i resprayed the front bumper of my Excursion last summer completely using rattle can from a company called Automotive Touchup, rather than trying to fill each individual rock chip. the local auto body shop wanted $450 to respray it. i ordered everything from wet sandpaper, to plastic overspray wrap, to painting tape, to primer, to color coat, to laquer, and it cost me under $100 in supplies. it came out awesome and i did it in my driveway! the neat thing they have is a plastic trigger mechanism (i think it costs like $3 o4 $4) that affixes to the rattle can so you can spray by squeezing a trigger (like on a paint gun), rather than pressing your index finger down on a button where it quickly gets tired. you spray nice and even coats this way, and it works well.
i will try to dig up some pictures of the repairs i have made, i am not sure i have any before and after of dr. colorchip repairs, but i do have some of my resprayed bumper.