Measure the length and width of the area of your yard to be painted. Multiply these two figures to calculate the square footage. Use this number to purchase the correct amount of grass paint.
Allow the grass to dry completely. Also, check the weather forecast for rain and/or gusty wind. Avoid spraying under windy conditions. Grass paint requires two hours of drying time before it becomes waterproof.
Mow your lawn if the grass is excessively long. Bag the clippings.
Protect areas from overspray by applying drop cloths, newspaper or cardboard to fences, driveways, walkways and plants.
Mix the grass dye solution in water according to the package directions. Pour the mixture into your backpack sprayer.
Put on gloves, protective shoes, eye protection and a breathing device before beginning.
Choose a place to begin spraying your grass that allows you easy exit when the project is complete. In other words, don't paint yourself into a corner.
Prime the backpack sprayer several times until it builds up a strong pressure. Adjust the spray nozzle to emit a wide spray. Holding the nozzle about 4 inches above the grass move the spray wand back and forth in a 2-foot square. When the square is completely green, move over and begin spraying another 2-foot square area. Continue this process until you paint the entire area.
Allow the paint to dry for two hours before allowing children, pets or other foot traffic on the grass.