I had wrapped our stainless sink which already had a sound dampening coating on it, with a couple of layers of Dyna-Mat. Dyna-mat is a car audio product designed to absorb vibrations and is commonly adhered to car doors, floors and the likes of which you would like to minimize rattles and noise. The double layer I had applied probably added 3/16" of thickness to the coating that was there. FYI - I really like the Dyna-mat on the outside of the sink as it really reduces the thin and hollow sound of a stainless sink. It makes it a dull thud when you bump dishes and pans into it now. It is so much better. Here's what I bough on Amazon if anyone is interested:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Dynamat-10425-18-34-x-32-34-x-0-067-34-Thick-Self-Adhesive-Sound-Deadener-with-Xtreme-Wedge-Pack/dp/B00020CAVA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Dynamat 10425 18" x 32" x 0.067" Thick Self-Adhesive Sound Deadener with Xtreme Wedge Pack</a>&nbsp;I purchased 2 and cut them in half lengthwise. Be careful of the sharp foil edges.