Myself and several others here use them for chrome trim with good results. I don't necessary like foiling myself but I do think the results are better with the foil. This is one example of a build with the Sharpie....
Just finished up this AMT Charger. This was an older kit and I'll have to say a lot better quality than some of their newer ones. I had to keep reminding myself it was not a Revell kit. Paint is rattle can Tamiya Light Gun Metal Metallic with Future brushed on and Fireball Modelworks tire decals. Great kit to put together! I got so carried away on how easily the chassis slipped into the body that I forgot to install the rear view mirror. Thanks for looking and all comments welcome.