undercoating

Hi folks, i just bought ABRO undercoating spray, thinking to use it on wheel wells of my Genny, its written on it that its gonna decrease road noise. My question is that; can just an undercoating spray really do that job or its just a waste of time? Have any one tried that before any...

Does anyone know if our Gennys are undercoated? IOW, did they come to the dealership undercoated? If not undercoated, do any of you think a good undercoating would help with sound insulation?

If you did that, then can you share your experience, i.e. what undercoating specs and brand was done and did you see improvement in cars road noise reduction or any other stuff? Thanks for sharing.:o