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Alright, I'm confused.
I've seen some really nice ork skin painted before and most of what I've read says to water down the paints for proper blending so you don't get these abrupt color differences.
I just tried watering down my paints a bit so I could blend various shades of ork skin. I really didn't put that much water in (I'd imagine 80% paint, 20% water) and tried painting it on one of my orks...
It acted just like ink. The color I was trying to highlight with washed right into the crevasses of the model thanks to the water and basically ruined what I tried it on.
I am clearly not understanding this painting stuff. The only times my ork skin has come out even decent looking is when I simply coat it in goblin green and black ink it. What am I doing wrong? Too much water?
Try not to get so much paint on the brush. You can always dab a bit off on a napkin/paper towel. This should help you quite a bit. Also you want the paint to be about the consistency of cream. A slight translucence to the paint is good but if it is too watery you might be being counter-productive (especially if painted over a darker base such as black).
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Wet blending is a much harder technique than simple highlighting. With GW paints, you will need a retarder to lengthen the drying time of your paint. I wouldn't recommend wet blending for beginners. I can't even get decent looking results with it.
From what you discribe though, it does sound like you simply have way to much paint on the brush. For simple highlighting, use paint watered down, say 1:1 water to paint, and just mix in layers. Do a layer of a dark green, then mix up some dark green and lighter green, and paint that over the first coat, avoiding the crevases. Work your way up in numerous coats, getting brighter as you go.
Of course, for orks, drybrushing is probably the way to go. It will look a little texture-ish, (word?), but will look very nice, and gork knows you have a LOT of models to paint. Working up highlights on each individual boy can take ages.
I have a ton of ork boyz laying around that are unpainted, so I was sacrificing one before I actually started painting my ork warboss, hence why I'm trying really hard to make it look appropriate. I'll give drybrushing the skin a go, though.