I also want to give a plug regarding a very useful tool called the Colour Shaper. You can purchase it at most art stores, online or actual stores, or at : http://www.royaldesignstudio.com/shop_supplies_detail.php?id=1304. I use the shaper tool to fill in stencils with usually a smooth medium. I have another Colour Shaper tool that is actually perforated, allowing one to move the medium over curved surfaces, such as columns. Handy dandy!