Do your research on this.

I spent hours going over the different product types.

The peal and seal stuff at lowes is asphalt based and though I have no first hand experience with it, from what I read I decided to steer clear of it.

I ended up going with Damplifier pro from 2nd skin. It doesnt so much eliminate air born noise it is designed to eliminate vibrational noise like hitting a drum.

I only wish that I would have used a thermal blanket too under the carpet as I still get heat up from the floors. Some people get carried away appling the stuff.

Some peaple swear by the spray in stuff too.

http://store.secondskinaudio.com/noise-vibration-coatings/

The problem is how do you measure how well its working. Its all very subjective, and in my opinion just a matter of a degrees between them all. Its also very difficult to find someone that has used different products that doesn't have a biased opinion.