Dynomat is probably the leading name in sound deadening automotive adhesive material out there. When re-doing the interior of a classic car, sound deadening material is a must and should be used on most all of the interior panels and once the interior is re-installed makes a night and day difference. If you have a decent stainless steel sink in your kitchen, take a look underneath and you'll see strips of a similar material adhered to it to keep it quiet while running water. In this case you are paying extra for the convenience of a top name brand and that it comes as a pre cut kit. I have used a product called FatMat that is less expensive and provides the same effect, there are several other options but the quality can definitely vary. For my fairings, bat, shark, and lowers I've mounted some in the speaker enclosures and a couple of strips on the large areas of the outer fairings for sound deadening. Any more material, just like on your sink, is not necessary.