I fish a place that has noise-lots of it-on a regular basis. When I had a metal boat, if you clunked the side or bottom of the boat real hard it was out of the morm and the bite would noticably decrease. After a while it would return most times. But not always. Anything put in direct contact with the hull, like carpet or foam, will deaden the vibration caused by the impact and quiet the boat some. Spray floatation, as done from a manufacturer, would work best but the surface it's applied to must be clean for adhesion. It also changes draining capabilities. Let us all know how it works out.