Ok, i asked this about 6 weeks ago, and we all pretty much agreed that it wouldn't be a good idea then. Quick background....lawn was treated w/crabgrass control and fert 3rd week of April. No noticeable response from initial fert app. Since then, I have taken over the lawn, aerated and topdressed w/compost, then fertilized with nutrients plus. Lawn responded well to compost and organic fert, briefly. Now back to light green. Pretty sure it is due to the crappy seed put down last fall (Brand new lawn). I will be picking up my soil test on Monday, so I'm sure that will tell me quite a bit. Customer really wants to overseed lawn. We have had a ridiculous amount of rain this spring/early summer....June set a record for wettest ever. Plus the lawn is irrigated, so plenty of water has fallen on this property I'm thinking that I will seed the week after next. That will be a solid 10 weeks since the pre emerg, plus a ton of rain. I will be aerating and top dressing along with the seed for a second time. Any thoughts????