Paint the wall to be plastered with primer.
Mix your choice of colorant into the plaster.
Scoop a blob of plaster into the trowel.
Apply a thick coat of plaster with the trowel at a 45-degree angle starting from one corner of the wall.
Continue applying a thick coat until the entire wall is covered.
Allow to dry completely.
Scrape any clumps off with the 4-inch blade at a narrow angle from the wall.
Apply a second, thinner coat. Cover the entire wall and allow to dry. Scrape any clumps off with the 4-inch blade. Repeat this step several times until you achieve the desired thickness.
Smooth the wall with fine steel wool, working in a circular motion.
Apply a thin coat of liquid furniture wax with the steel trowel for increased water resistance.
Allow the wax to dry, and buff with a clean cotton cloth.