Bumper cover glue?
 

My 04 Cooper S JCW has a broken off tab on the right side of my rear bumper cover, the one that mates with the inner fender liner, and I was hoping to glue it back on and then strengthen it with JB Weld, but so far Locktite super glue and liquid Testors plastic cement have not stuck to the bumper cover material. Anyone know what this material is and what glue might work to glue the tab back on?