Whitey and New, No reason to be skeptical of Lesco seed. I used 12,000 lb last year and seeded over 30 acres of lawns. Out of the 12,000 lb I only used about 400lb of a KYB/PR mix (which was for an athletic field). You can overseed a KYB lawn with TTTF. With the fine blade on the TTTF it mixes really well. If a lawn is really thin and has any KY31 Fescue, I will usually gly it and start over. But I only do about 1 out of 10 this way. With all the lawns I seeded in 2007 I am trying to turn all my customers lawns into TTTF and KYB lawns so they will handle our summer stress better. IMO New, it is the only way to go! When you get info on here....make sure it is not someone from New Mexico or somewhere way far away. They are not from here so what works in their area may not work the best here. As far as topdressing....I am not sure why you would do it! If you are needing to bring in topsoil or increase OM....haul it in and then seed. I wouldn't topdress on what you have seeded and you may get it too deep which will reduce germination. Also New...I recommend using a slice seeder and going two directions. As Whitey said, if you aerate first that would be great but then you are renting two pieces of equipement. Aerating first isn't a must but would be good. Also I wouldn't use any straw (or hay as you call it). If you use straw it will cause more or a mess then it is worth. I NEVER straw and that is a great advantage of slice seeding. It can actually choke our your new grass. PM me if you need any additional info. Seeding is a large part of my business!