I cant make an stencil using texture painting I am trying to use a stencil using an Alpha Mask so I can place a typography (png image) to a 3d model. I tried  it a few days ago an it was all fine however i made a new mesh and now its seems that I cant make it work.  

I made two basic bsdf materials, along with a texture with 0 alpha level, the texture attached to the secondary material. The texture (material base color) is also connected with the fac of the Mix shader. The Brush is set as "Mix". I also checked to flip normals in case I have been painting on the inside of the model.

I dont know what else to try. When I click the left buttom of the mouse the color of the model gets a little darker, thats all.
I had the same problem, but then I realized, that my normals where flipped.
So to be able to draw with the stencil method, make shure that the normals of your mesh are oriented the right way (blue) or turn off backface culling in the brush settings (active tool and worspace settings &gt; options &gt; backface culling).