I used the langka system on my G35 and was not very happy with the results. Made the scratch more noticeable and had better luck with some touch up and a light wet sand and polish.
+1
Chemical resistant gloves are what i use at work they are called Nitrile. They stop the solvents from getting into your pours unlike Latex.
The two biggest problem with over the counter/ dealer T-up are:
1)The rediculously large brush that is included, making you cover the spot instead of filling it.
2)The paint is often too thick (not reduced enough) causing blobs.
I've never seen any T-up paint for 3 stage Pearl white that looks great, no two production vehicles are exactly the same. It's acually best to just use a slightly brighter white, after a short time dirt will settle in and even it out.
My lowest cost suggestion is to buy a percision fine tip brush from a hobbie/craft store (a buck or two) Get your color from the stealership making sure it has an opening w/crap brush, not that paint ball pen crap and find some type of reducer (lacqure thinner or mineral spirits) to thin it down.
Pour some paint in a small clean container of your choosing, add a small amount of reducer, mix and
Fill the chip with very small dabs taking your time. You can always touch it up a second time for coverage. This takes practice and a steady hand, if your unhappy the first time wipe it out with a reducer dampened towel and try agian
My chicago peeps are always welcome to stop by, I do this all the time.