Actually, I'm not crazy about using a wet brush with the pressed pigments, bacteria or no bacteria. They have a sort of creamy texture that applying them wet does something to and can make them a little scaly after. If you want a strong application of them, you get better results just applying them with the smooth silicon applicators (love those for the pps) or a finger, instead of using a brush; and then after, you can give a very light misting of Fix+ directly to the eyes. Applying them on top of another shadow also is a good way to minimize the sheerness a lot of them have.
Maybe this new batch will be a little different, but I think wet application on these is going to continue to have some problems.