1. Spread your drop cloth out and cut off any seams because these are not useable. Cut the drop cloth to various sizes. If your using pre-primed canvas you can start at step 11.
2. Take your straight edge and a pencil to square your drop cloth along the edges.
3. Staple your drop cloth to a board or heavy piece of cardboard and pull the fabric taut. Spray water on your stretched drop cloth to remove any wrinkles. You can also use an iron to remove wrinkles.
4. While your drop cloth is stapled apply 2 coats of gesso or exterior paint to the front of the floorcloth only. You'll prime the back later.
5. When your drop cloth is dry take your straightedge and a pencil and square up the edges. Drop cloths will shrink and warp around the edges to some degree when you apply the paint so cut off the areas that may have warped.
6. For a finished placemat that is 13" x 17" (like the one shown in our example) cut a section of primed drop cloth 15" x 19". This allows for a 1" hem. It's a good idea to save the scrap sections of primed drop cloth so that you can practice stenciling before you work on your main project.
7. Turn your primed 15" x 19" piece of drop cloth over so that the primed side is facing down. Now is the time to make your hem and mitered corners. Take your ruler and place the edge of it an inch from the edge of your place mat. Wrap the edge of the placemat over the ruler to make a crease. Continue creasing your place mat until you've done all four sides.