I have a beat up old jon boat that was given to me as a gift. After multiple attempt to stop the leaking, I have begun the painstaking process of sanding and re-reviting the boat. The problem is there is more tar than tin on this boat! The tin is still good but whoever put the tar on, however long ago, was not shy with it. Anyone have any tips for removing tar? (other than getting rid of the boat. lol)