Dwayne wrote:

I am renting an aerator next week and plan on overseeding my lawn. My
question is that I have a lot of weeds and dandilions in my yard. Should I
overseed first and then wait a month or two and put weed control on the lawn
or should I put weed control on first and then wait the appropriate time and
then overseed? Thanks in advance for any advise.

Your lawn must be very flat for a dethatcher-slice seeder to work.
Rolling with a typical rented roller will not make it level enough.