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If you use a starter fertilizer designed for this purpose, you can overseed and fertilize at the same time. If you opt to use a fertilizer for established grass or one with a weed control component, it's best to wait at least four to eight weeks after seed application to allow the new grass to take hold and establish itself. 

Power seeding and aeration are both excellent ways to improve lawn health, but they serve different functions. Aeration focuses on improving soil health by creating channels that allow more water, oxygen, and carbon dioxide to reach the roots. In contrast, power seeding is a method of planting grass seeds, often by creating narrow trenches in the soil. One service isn't better than the other; they are complementary. It is beneficial to aerate your lawn before power seeding, as this makes the seeding more effective by helping the germinating seeds access the resources they need. It's a good practice to aerate your lawn once or twice a year, regardless of whether you plan to power seed.

Power seeding can be worth it if your existing lawn is looking sparse or patchy. Power seeding can quickly and effectively plant new grass seeds and help grow a thicker lawn. But if your lawn is in pretty good health but could use a little more TLC through dethatching, fertilizing, weeding, or aerating, you may not need to spend money on power seeding costs.

When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.