I never really edged many models but the few I attempted with marker failed horribly (bleed through on the back-side). I regularly paint miniatures, so I find the process easily transferable with a tiny brush, and the paints are more easily directed. Thick enough too that it doesn't bleed too badly. I like building so much (and I am terribly impatient) so edging last gets me the model, and if I'm happy with it, I can then 'finish' it at my leisure.
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