yesterday I helped my friend try to remove that piece of aluminum from his transom bonded with 5200. To say it was on there is an understatement but he got some anti-bond 2015 from West Marine and we followed directions and after about 1/2 hour it finally popped free. Let me tell you we were outside and that stuff is potent we were both dizzy from smelling the fumes so don't try this inside...lol or wear protection but it works like advertised.