Out of curiosity where exactly do you want to do this (surface, colour etc.)? I\'ve done weathering a couple of times that would be equivalent to powder burns in look but how I might approach it would depend to some extent on the material represented.
In general tight, low-pressure spraying with an airbrush will work excellently if you have one and the surface isn\'t too complex, you can also use \'glazes\' (thin, layered buildup) to do this quite easily if you\'re patient.
Originally posted by atacam
I\'ve thought about stippling, but even using a very fine brush I think the specks would look too chunky.
Well there\'s stippling and there\'s
stippling, it doesn\'t have to be that rough looking
One thing you might try is a combination of very gentle stippling - soft brush, used damp with very little paint - with glazing used over it to soften the effect afterwards if you think it needs it. I\'ll often do something like this to build up an effect so it\'s not obvious how it was done.
Einion