We have this Q bond stuff in the workshop that sticks anything to plastics, We glued the heads of bolts to the back of plastic bumpers with this gear and it wont let go. Its a two part thing with a powder and glue. You could bond welding studs to the back of the dash. The carbon would let go before the stud came off, just buff up both the stud and the carbon. The only thing with this gear is its instant so make sure your in the proper place with everything.
http://www.google.co.uk/imgres?imgur...QEwBA&dur=1449
http://www.camberleyautofactors.com/...ond-qb2-detail
Bob