Sometimes you can do a job with leftovers. For example, if you have gray paint from another task and you need brown, you can add some tint. Tints give you the power to alter colors to your own needs. Gray is a neutral color. Technically, it has no hue. However, grays generally contain just a hint of color. Brown is neutral, but with hue. When you mix all the colors, brown results. For a rapid job, mix complements. They will cancel each other out, overpower the gray, and provide brown paint for your new task.
Open the can carefully. Lay the lid aside.
Add equal amounts of all three tints — brown, red and green. Start with about 1 ounce each. The red and green are pigment rich. This will speed the process.
Put the mixing attachment in the drill. Tighten the chuck.
Submerge the end of the attachment into the paint.
Turn on the drill. Increase the speed slowly.
Mix until the color is uniform.
Evaluate your color. If it's too gray still, repeat Step 2. If it's gray-reddish, add an ounce of brown and 1/2 ounce of green tint. If it's green-gray, add an ounce of brown and 1/2 ounce of red. Mix again.
Repeat until you achieve your desired brown.