Ball point pens don't work, but any felt tipped pen will be OK. Test it on a separate piece first, some of them are solvent soluble and will bleed if you varnish over them, years ago I used the ultra-fine black sharpies to line my Salamanders and got a little bit of bleeding when I clearcoated them. Also, wait at least overnight after you've painted the models for the paint to harden, fresh paint even if it's dry to the touch will clog up the pens
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