Apply repair mix to the lawn during the fall or spring months, since grass seed germinates most successfully in mild temperatures.
Loosen the top 3 inches of soil within the damaged area using a gardening claw or screwdriver. If your soil is unhealthy, add a nutrient-rich seeding soil to the damaged area, and mix it as you loosen the soil.
Spread the lawn repair mix to the damaged area. Apply the mix sparingly, so it is not more than 1/2 inch deep over the loosened soil.
Water the patches after you apply the repair mix. After initial application, water the patches twice a day until new grass seeds sprout through the soil. Spray the area with a misting attachment for 10 minutes twice a day to prevent flooding new roots.