If you are putting down a 24 hour grub killer to kill adult grubs, then I would say yes its ok. Read the label to make sure. Usually these products need to be immediately watered in. In late June, every year, put down a grub preventative-Merit so they won't have this problem in future.
Since the grubs you have now are adult, you will have a harder time killing them. They won't do much damage to the lawn, but the skunks, etc. will do more damage digging them up.
Obama is so bad, Kenyans are accusing him of being born in the USA.