Heck, if you don't have to worry about the paint right now you could use diesel fuel, PBblaster,Kroil or even let it sit and soak with Marvel Mystery oil or whatever you normally use. Let us know what you find, and what you use. Always good to learn new things. If it is "sealed" it may require something to break it down. In that case go to sometype paint store and someone will tell you what to use if it happened to be say, gutter seal, or sometype caulking. You may just need to use paint thinner etc....I think you get the idea.
