Summary: remnants of the jute padding that the factory decided to glue down to that spot so I had to spend some time with a bottle of adhesive remover and some elbow grease to clean all that away The Dynamat instructions urge cleanliness over and over so I hit the interior with a shopvac then wiped it all down with denatured alcohol Then I hit it all with a shopvac again and ran a
Image Dimensions: 450 x 300
Image originally found here.