I just broke out a few "artsy" pens because I have a project coming up in the eventual future for which I need some non-feathery lines too. I sanded a bare spot into my neo-psychedelic pine scrap drawing tester chunk.
Sharpie Ultra Fine Point - Fail, fail fail. Being fine is not the same as staying in your borders - feather fury.
Alvin TechLiner "technical drawing marker" - Win, Win scenario. No feathering, supposedly "archival" fadeproof ink. Comes in all sorts of sizes, I have a black 0.3mm & 0.5mm size, but art supply places have an assortment of them.
Sakura Pigma Micron pens - Win, win, winwinwin etc. These also come in a wide variety of sizes, oil-based "archival ink."
http://www.dickblick.com/products/sakura-pigma-micron-pen/
My mom used to use these for intricate "pen & ink" house drawings, for which she charged a pretty penny. The disposable Microns are designed to go head-to-head with Koh-i-Noor Rapidographs & the similar Staedtler Marsmatics and Rotring technical drawing pens. But no clogging, no cleaning... though it might take half-a-dozen to do a guitar, depending on what complexity you're after. But the other "win" in there - they are available in a bunch of colors too, and Sakura uses the SAME INK in their Pigma BRUSH pens. It's more like a flexible, long-wearing felt tip kind of thing, but you get coverage out of them. And the color matching is already done. My mom gave me all her old Rapidographs when she went over to the darkside, and it took me a couple of weeks of soaking and blowing and blasting to get about 2/3 of them working again. You are supposed to be able to use oil-based & archival inks in the Rapidographs*, but you can't leave 'em sit for five years afterwards. :toothy12:
There's a lot of competing stuff out there, back up through a few Blick catalog pages; the Copic and Faber Castells are popular and have the same color-matching across multiple sizes and types of pens if you stay with one brand.
*(I've got fountain pen ink in them now, and I expect to do some outline work with those, but everything's going to be blended around and feathering isn't a problem. In fact fountain pen ink and the water-based powdered and liquid dye concentrates from LMII are within one or two percent the exact same stuff. As is Easter Egg dye, RIT for your tie-dyed T-shirts, the yellow food dye #2 that Kraft uses to make white cheese a bright fluorescent orange, etc.)
If you have any interest in the water-based side of the aisle, the new “water brush pens” are way cool. They were originally designed to put water in them to blend watercolors and inks around – then some nut said “why don't we just put the ink or dye INTO the water pen” and thousands of heads exploded. THEY ALL LEAK ONTO YOUR FINGERS. Battle scars, to be worn with pride....
http://www.dickblick.com/products/sakura-koi-water-brush/
http://www.dickblick.com/products/niji-waterbrush/
