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You can try that, but it isn't likely to yield results. It's like watering potted plants without putting the seeds in. Most of the tossed grass seeds sit on top of the soil or existing grass blades and never germinate. The seeds need to make it into the soil, just like growing a potted plant. The best way to accomplish this is to aerate your lawn first, then overseed.

Yes, you should water the lawn after aerating. Now that you’ve loosened up the soil to better receive nutrients, it’s time to hydrate and fertilize your lawn. You’ll want to keep it evenly moist to promote healthy growth. Don’t drown your grass—too much of a good thing can reverse all the work you’ve done with aeration in the first place. But especially if you’ve overseeded and/or fertilized after aeration, you’ll want to ensure a moist soil layer to absorb those nutrients and fuel for new growth.

Lawn aerators range in cost depending on what type of aerator you’re purchasing. For example, a manual spike aerator might cost as little as $25, while a motorized core aerator will likely cost more than $1,000. Fortunately, these expensive pieces of equipment can be easily rented from many vendors for far less money.

There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun.