Killex has the same ingredients of weed control as the ones in fertilizer. It will kill broadleaf weed but not the grass. If the weed in your lawn does not response to your fertilizer, it would not response to Killex. I suspect they are crabgrass or quick grass. They are annual grass. They will die over winter but leave lot of seeds to germinate next spring. Traditional you have to use pre-germinate herbicide at April to prevent it from germination.
I had few of those; I usually hand pull them early in the spring and reseed the spot. But now is too late. I think you can use Roundup( It will kill any green things). Spot spray the weeds, let it die. You should just leave them there, so the die weed would hold the position preventing other weeds to take their place. At September reseed or lay new sods at the spot. The best thing to do is kill them before seeding, hope it is not too late.
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