got an old Ben Pearson pro staff 70 inch recurve its limbs had been backed with some kind of cloth the cloth had stated to come off the limbs so i thought i pull it off now the back of the limb is really rought and looks like the top layer of the fiber glass has come off with the cloth and it looks like little spots. Is there any way to fix this i have not taken to backing of the second limb any ideas how to take it off safely