Combine your top dressing mix in a wheelbarrow using a hoe for stirring the mixture together. Use three parts sand, three parts loam and one part peat in the mix. Make sure all three ingredients are dry to ensure an even mixing of the parts.
Place a 1/4-inch soil sieve onto a 5-gallon bucket and push the mixture through to create a dressing fine enough to slide through the grass stems to the soil beneath.
Distribute the dressing over the grass using a spade. Spread the mix evenly over the grass, using about 3 pounds of mix for every square yard of grass covered.
Run the backside of a rake over the grass after dressing distribution in order to spread the mixture more evenly and to work the mix into the top of the soil.
Examine the grass for any signs of the dressing on top. Go over these areas a second time with the rake to push the dressing down to the soil.