With your brush, start in the top corner and cut in a three-foot section of BEHR Sand or Smooth Texture Paint across the wall or ceiling. Liberally reload the brush as necessary to achieve a 3' strip that is approximately 3" wide.
Starting in a 3' x 3' section at a top corner of your project, roll the BEHR Texture Paint onto the surface. Work the roller back and forth across the wall until the 3' section is completely filled.
Repeat this process of painting 3' sections until the initial section has set-up, or dried slightly, typically after approximately 15 - 20 minutes.
After the first coat has set, return to the top corner of your newly textured surface and roll a second coat of texture paint onto a 3' section. Allow the second coat to set for 5 minutes.
Next, using a putty knife or trowel, lightly smooth out the surface of the 3' x 3' section. Work from top to bottom or side to side within the section until you have created a look you like.
With your roller, texture the next 3' x 3' section to the side of the previous one. Allow it to set for 5 minutes.
Using the putty knife or trowel, use the same technique to smooth out the new 3' x 3' section. As you go, overlap and blend each section to avoid hard edges.
Continue creating 3' knockdown sections across the wall. Repeat the process of texturing and blending until the entire surface is covered.
BEHR Texture Paint applied to the wall should be painted for the best protection and to change the color. BEHR Texture Paint on the ceiling may be painted if you want to change the color. Allow texture paint to dry for 24 - 48 hours prior to applying a coat of paint.