Slit seeding is more. To clarify what I said up top, I was in a hurry, oops. Aeration and seeding without renovation to hardpan clay is a waste of resources, time and customer money. In most cases the grass will not do well during the heat. HOWEVER, if you have this yard year after year and compost it every season after aeration and seeding you will see greatly improved turf each year.
89 Chevy Silverado 1500 4x4