Lightly dab the flat-head foam brush into the paint (making sure it is not full) then gently press (small motions) into the center of the stencil. Be careful not to get paint on the grout and not to press too hard or the paint will bleed under the stencil.
Carefully remove the stencil and gently wash it off and dry it before moving on to the next tile. Paint all of the center designs on all the tiles and let them dry completely before moving on to the outside sections of the tiles. If you mistakenly get paint where you don't want it, use a cotton swab to remove the paint.
Place another stencil at an angle to create the second part of your pattern. Tape the stencil down and apply paint in the same way you did with the first piece. Carefully create one corner at a time and let each corner dry completely before moving on to the next tile. This will help prevent accidental smudges.
When the tiles are dry, apply the first coat of a sealer. Using a foam brush, gently brush across the tile in one direction. Do not go back and forth over the same spot because you could mistakenly drag the paint across the tile. Start at the top of the tile and gently work down. Go over each spot only once. Let dry then apply a second coat, and repeat for a third coat.