I am looking for a very strong and long lasting adhesive to attach the edge of the acoustic matt around the edge of the perimeter of the ceiling so there is no flanking noise. The area in the joint of the ceiling with the wall is uneven from breaking the old ceiling plasterboard. I am installing Tecsound 50 mat (self-adhesive but for installing purpose and would not last) over the resilient bars and 50mm down the wall all-round the ceiling. Any good adhesive to bond the rubber with the plaster and bricks?