I'm trying to remove the paint from a recent production metal Lionel PS-4 flatcar. Thus far the paint has been totally resistant to several days of immersion in LA's Awesome (my usual), and then again in 91% isopropyl alcohol. With a steel brush I can get some of the paint off, but it looks very sloppy and does not constitute in my opinion an acceptable foundation for a new paint job. So, what chemical would you recommend? I don't have access to a sand blaster. Thanks.