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My questions still stand, as far as I can tell.
We may be drifting away from the initial subject matter, which is fine. My client's lawn had areas that were completely devoid of grass, or any green vegetation whatsoever - just dead thatch, mat, or whatever you would want to call the fibrous plant structures left over after turfgrass dies. One area was 900 square feet (about 30' by 30').
As far as spot seeding goes, I assume you mean spots measuring a few square feet. Only once did I do such spot-seeding. Generally, if I encounter a lawn needing spring seeding, I will seed in early spring, then rely on post-emergence control (of crabgrass and other undesirables). A few times I have applied the pre-emergence in late spring, after the new grass was mowed several times.
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