Well I got most of my undercoating off today and it wasnt very hard at all. I started scraping a while back and only got about a 5"x5" section done and I got tired and said theres got to be a better way.
Well this is what I did, I got a gallon of the aircraft stripper and brushed it on over the under coating and let it set for a couple of minutes while I preped my Power Washer, This is a 13HP Honda Engine Powered, 3500 PSI power washer with a 15 degree angle jet. I just went at it and couple of hours later all my undercoating is off and the original paint is still on the bottom but it does make a mess every way so be prepared to clean everything around you, including yourself, with the power washer.