[RickM]

BTW, I obtain best results by prepping bare areas with a roto tiller, using a coated seed (Pennigton) to prevent birds from eating, raking in and covering with a medium layer of straw (not hay). Water as recommended above.

The straw protects from heavy rain, too much sun and birds. For revitalizing a lawn you can rent a core aerator, thatcher and seeder for low bucks at HD or rental places.

Also, many seed mixes contain an annual and perrenial seed. The annual (Fescues?) grows very quickly and protects the perrenial (Rye?) grass as it takes longer to germinate.