You might want to go to: www.soundproofing.org, they sell a wide variety of soundproofing products and have a number of pages and solutions for noise abatement problems.
Have you considered carpeting with heavy vinyl padding underneath? I'd pursue more research before I just slathered something on the floor hoping that it will do the trick.
BTW I am in no way related to anyone or have any vested interest in soundproofing.org.
I am an audio engineer however and right in the middle of a noise abatement problem of my own that I am trying to resolve...
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