why not use magnetic tape with foam backing?

[cinnacracker]

Hi.  I am looking at the magentseal system and I was wondering about small irregularities inbetween the magnet and the bracket that they attach to.   If everything is not completely flat, (acrylic, magnet thickness, metal bracket face, whatever its attached to....) there might be small gaps allowing sounds to sneak through.  Wouldnt it be useful to use magetic strip that comes with a thin foam backing to take up any tolerance issues?  Basically the magnet could have a little "float" to it.

Appreciate any input.  We bought 5 soundproofwindows.com windows and hate the aesthetics of them.  We're now looking to DIY about 25 windows in our home. 

Thanks,
Karen