Acoustic sealant

I need to use an acoustic sealant to seal around my plasterboard ceiling. I live in the bowels of Cornwall & nobody has ever heard of this amazing newfangled product here. I ve looked on the net that they all seem to be intumescent sealant which as a by product have acoustic properties also, but I do not need a fire proof sealant, just a sound proof one. It seems to be an acrylic non-drying mastic that I need, and I was wondering if I could use roof and gutter sealant which is a bitumen based non-drying mastic. Any body any experience of these mastics? Cheers Stuart
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