One of the things I never realized that I had any interest in until my trip to Japan was Gundam Models. You could click the link to Wikipedia's page on Gundam Models, but the basic idea is they are plastic models from a Japanese Animated (Anime if you prefer) Science Fiction series rather than plastic models of battle ships or muscle cars. I was on the plane browsing through the Japanese version of Sky Mall when I saw an ANA themed Gundam. While I was initially repulsed by the over-commercialization of an already overly commercialized brand, I was intrigued. Would Japanese businessmen really purchase these for their children to assemble when they return home? Are Gundam models really that easy and look that cool? I wanted to be that cool, but I was unwilling to pay extra for one due to a weak dollar-to-yen ratio. So I did what any sensible person would do: I waited until later and picked one up on the cheap on eBay.
While I haven't taken the time to do vigorous testing, the consensus is that you should only rely on pigment markers or pigment pens and the narrower the tip the better. This Pigma Micron pen has a point of only 0.20mm (the smallest you'll find on a Pigma Micron) and the pigment based ink means it'll permanently work on any surface you apply it to. So if you are looking for a great pen that will draw some great panel lining on painted or unpainted model pieces, look no further. You'll draw lines as thin and as steady as your hand can create. If you really want to go overboard, ITOYA offers a 0.10mm pigment pen but the Gundam modelers have never mentioned that particular brand.