tall fescue has a low seed count per pound compared to blue grass. so you need 4-5 times more seed than bluegrass. if your overseeding use 8lbs per thousand feet. need fescue lawns need 12lbs per thousand. a starter fert helps alots 19-19-19 works well at 5lbs per thousand. water and stand back. note that fescues like warm weather so start seeding soon.good luck and good growing
Pardon me for putting in my $.02 but triple 19 is good, the grass will grow fast but you will need to cut it every 4 to 5 days(it will be green) and it will not be very stress tolerant seeding at this point of the summer.18-24-12 is a good starter fretilizer. Fescue, be it tall or fine is a cool season grass and it is best to seed in mid to late September(at least in the mid south)The most active growth will be at temps. between 60 and 75 degrees, several days above the 80 degree mark will stress it. Also use a slow release fert. to prevent the risk of burn!Ask you local supplier for what is best for your area. Good luck !