Originally Posted by
ps_bond
Depends on the complexity of the design - sometimes I'll use permanent marker I scribe through, but for more detailed stuff (e.g. engraving) then I tend to use gouache. I've just checked mine - it's Winsor & Newton Designer's Gouache. You only use a tiny amount, smeared on with a finger, so a small tube goes a very long way. I've also used a 1/2 pan of student-grade Chinese White watercolour, applied with a damp finger, but I prefer the gouache.
Might be worth trying the cheap poster paints as a possible alternative?
In a pinch I've used car primer on steel, but never mind!
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