angus99
Guru
Local redneck boatsmen use a little heat and a razor blade on the stuff to break it free.
So does at least one well-traveled, semi-sophisticated "yachtsman."
Using a razor blade, a heat gun very carefully applied, light pressure from a small pry bar or chisel slowly wedged in and plenty of patience, you can separate almost anything bedded in 5200 without damage and without chemicals.