Most good results take some effort, which you found. Warming the decals a bit with a heat gun would help soften the adhesive. Have to be careful not to burn the paint, though.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.