I was having the same problem until I found this: http://www.xxxmain.com/glue.shtml

Find the "DuPont" that you want in a magazine and.........using this lexan glue, glue it to the inside of the body.

I'm sure some people have used this stuff, tho, I haven't yet, but, I did order some to do the same thing that your trying to do, but, only with pix instead of decals. Cheaper, too!! Something to consider, considering if you do find the "DuPont" decal, it'll probably be about $6.

Just a thought.