Print image or letters on card stock. Cut each shape or letter from the card stock with the craft knife to create a stencil. Carefully preserve and set aside the centers of letters (such as "o" or "a"), if they are part of your design.
Spray the card stock stencil with stencil adhesive and position on top of stool. Replace centers of letters (using stencil adhesive) once the main stencil is positioned, if necessary.
Apply acrylic paint to stencil with a sea sponge. Let dry.