Hi Roger;

The tool that Rhed referred to is also available at Harbor Freight for 9.99 with three interchangeable blades, 9+ surfaces. It made scraping the interior a very short project. You can sharpen the blades with a grinder, file, block, etc., and they take curls like a plane and the glue just disappears. It was one of my most used tools during construction. There is probably a pic in one of my replies to Dale Frolander sometime in the recent past.

Best Regards, Spidey