Pump sprayers often are used to apply stains, but they should be rated for acid and have no metal parts. Acid will quickly destroy metal parts, which can affect the color of the stain. A spray tip with a circular pattern should be used, spraying in a pattern that goes from left to right and then right to left, with someone scrubbing the stain into the surface using a medium-bristle brush in a circular motion just behind the spray. It's important to scrub in the stain and not just push it around. An additional spray pass just behind the scrubbing removes brush marks. This method ensures good penetration and minimal marking from either the sprayer or brush.
Ragging or Sponging
Dabbing in colors with natural sea sponges or rags leaves a faux or marbling look. The twist of your wrist during application creates yet another different effect. In reality, most faux finishing techniques will work well with water reducible concentrate stains.
An airbrush can be used to add shading, details, and features; and to create unique designs. Stains must be allowed to cure for a minimum of four hours before applying the first coat of clear sealer.