Application - I want to bond layers of Contiboard (white laminated 15mm sheets of chipboard) together for the walls of loudspeakers I'm making. I have 3 layers of contiboard to bond, and my goal is dead, strong and sonically inert panels. This is particularly important for the side panels which are the largest. I will be pulling the layers together with 8mm bolts, exerting some force. One requirement is a flexible lossy bond, and I've used EvoStik for this before - I just hate using the stuff so prefer something less toxic. Don't want anything that dries rigid or goes hard and fractures. I've tried putting self-adhesive roofing strip (black tarry stuff) between the Contiboard, and while this is great for sound deadening, it seeps out particulalry when warm, so the bond isn't really inert once it's been put together. So - what kind of glue can be put on fairly thickly to make a lossy layer, glues Contiboard, and dries solid but rubbery and doesn't seep out of the cracks? Over to you! I have some solvent free Gripfill - is this any good, or does it go brittle when it dries? .
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