These are the mediums I use and love. Infact, I used them all in the creation of the canvases. The light splattering of specks is intentional and looks much better in reality than this poor quality photo.
Still being tempted by spraying the layer all in one go instead of light coatings, I'm a little impatient that way and pay for it with sometimes blotchy edges, although the can's black shading is meant to be jaggedy
6" by 6" stretched canvas