I can't claim credit for this info, it's from a post on MBWorld. There's some interesting products out there! The basic method seems to be the same among many of these. Personally, I think I'm going to try drcolorchip because I have read a lot of good things about their product.
a) Lanka Paint chip and scratch repair technologies, is both a chemical and mechanical process, once the touch up paint has dried, The Blob Eliminator® will re-soften the paint, and the light rubbing mechanically begins to "smooth" down the excess paint, with the touch up paint now appearing on the cloth - LANGKA Paint Chip and Scratch Repair
- Langka and Metallic Paint-the reason metallic looks different after using the product is the metallic flakes migrate to the upper level of the paint surface while setting up. To counter this, use the blue sanding card on edge immediately after applying the touch up, like a razor. This will remove most of the touch up while the metallic flakes are still suspended evenly throughout the paint, smearing the excess across the local area. Let dry and use the Langka to wipe away the smear tail left across the original (OME) paint. - LANGKA Paint Chip and Scratch Repair
b) A system called Sprayless Scratch Repair- Magic Touch
c) AutoSharp pen the pen itself is very easy to use. You simply shake it, depress the felt tip a few times to start the paint flow, and then begin to "colour" paint into the damaged areas, much like you would highlight a section of text in a book. AutoVisuals.com – The Best Automotive Paint Touch Up Using the AutoSharp Pen
Note: The newly applied paint will appear darker; it will eventually lighten to match once it has been exposed to UVR
d) Dr. ColorChip™ Paint Chip Repair system - Dr. ColorChip auto touch up paint kit for stone chip repair on your car- BMW, Ford, Honda, Mercedes, Porsche, Lexus, Honda, Toyota- all color codes
Paint chip repair companies- (UK) ChipsAway : welcome
e) Touchup123- Use detailer’s clay on panel to be treated, Wipe on Final Touch Compound to prep surface,
Wipe Colorfill on ENTIRE panel to cover all the blemishes, Wipe on Final Touch Compound to remove excess Colorfill, Wipe off haze of Final Touch Compound to leave a polished shiny finish, Touch up any left over larger chips with a brush (can be built up and smoothed out later with Final Touch Compound if desired) - http://www.touchup123.com/
Metallic paints, silvers and gold’s, have to be applied with care to avoid problems with the "colour flop". Colour flop is the term given when metallic flakes in the chip reflect light giving you a lighter or darker appearance. This is a variable that cannot be controlled, for best results; shake the paint very well to get the metallic flakes evenly distributed before you apply
f)Automotivetouchup.com dedicates itself to touch up paint, aerosol spray paint, and auto or car paint backed by a strong exact colour match guarantee for your basecoat/clear coat original finish. They offer touch up paint packaged in aerosol spray paint cans and touch up bottles with a brush in cap applicator as well as auto paint packaged in pints and quarts cans.
They guarantee your touch up paint or spray paint to match the original factory finish on all vehicles. Orders are custom matched to your vehicle using your original factory paint code and the highest computer technologies available. Not only is their touch up paint the exact colour; the size of metallic and pearl colour is the same in your paint.
g) Touch-Up Magic Application: (Touch-Up Magic
1.Thoroughly clean each chip or scratch with a silicone remover and shampoo.
2.Cover chip or scratch with touch-up paint.
3.Allow paint to dry to touch, but not hard. (Time varies with paints)
4.Dab-on Touch-Up Magic, wait 15-30 seconds.
5.Rub across blob with a soft cloth.
6.May also use plastic razor blade if necessary (included)
7.After repair has completely dried (24 hours), follow with your favourite swirl remover and wax.