Posted by zzed on 13 Aug 2012, 16:33
I stumbled upon the same problem when using combination of oil colours + white spirit. I tried to fix it by using only a small amount of pigments isolated of oily medium as much as possible and a lot of white spirit, but that didn't help much. I thought it was because of the low quality of oil colours, although I paid for them dearly, but now I think it is shiny due to this combination.
Perhaps you can try with an ordinary enamel colour plus Revell thinner for washing, maybe it will be less shiny. Also try to wash only crevices, not the whole figure. After that you can fix the flat areas with some highlighting.
Also some people are using inks, like games workshop/citadel, I never tried it myself though.
There is a huge amount of info about washes at the local OMF, involving a mixes of window cleaner or wooden floor cleaner, a drop of liquid soap and black ink. I think that will work best for you.