You can also use gesso (comes in black or white, but you can color the white) and just this past weekend I came upon the coolest stuff called Special Effect Paste! I used it with a stencil in my art journal and LOVE the results!!
Also try using your stencils with 3D stamp paint if you like the shimmery sparkly look. Its very pretty and comes in all sorts of colors.
Let me check the store here and see if they have the products Im talking about.......hang on.....