Echoing the advice in this help topic, InfiniteSkills trainer Andy Anderson has a helpful tutorial video on using the mixer brush tool in Photoshop CS6. First he shows its default effect on an image. He shows how it can be used non-destructively by putting its results in a new layer, and finally he goes through its options that mimic working with varying degrees of wet paint:
http://infiniteskills.com/blog/2012/08/adobe-photoshop-cs6-tutorial-us ing-the-mixer-brush/
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