I'm finishing up a early 60's French roadbike and was wondering if anyone here has used 'paint pens' to detail the lugs on a frame before. If so, how did it hold up? What conditions has it been in? (dry garaged, damp shed, ridden in dry weather only or in rain too?) It claims to be oil based, so did you clearcoat over it or just let it cure? Do they lay down a fairly thick layer or did you have to go over the lines several times to build up the layers?

Any thoughts would be appreciated, never had cause to work with these before and on the surface at least they seem like they might work for what i need.