Put on a dust mask to protect your lungs from clay dust as you work.
Sand the brick area you will be glazing using a sanding buffer with medium-grain sandpaper. Use slow, circular motions with the sanding buffer for 10 minutes, which will remove any jagged or rough edges.
Vacuum the entire brick area using a shop vacuum to remove any dust and debris from the sanding.
Fill the bottom of a painting tray with clear waterproof latex glaze. Select matte glaze if you want the finished brick to have a duller, flat appearance, or use glossy glaze if you want the bricks to be shiny.
Roll a sponge paint roller back and forth in the paint tray to coat it in the latex glaze, then apply the glaze by rolling over the brick area in an even layer. Cover the entire brick area with the latex glaze.
Dip a paintbrush into the glaze, then paint the glaze into the cracks and creases. Apply one layer.
Allow the entire brick area to dry for 12 hours, then apply a second coat in the same manner as before.
Allow the brick area to dry for an additional 12 hours before use.