Here's an application sheet. This material is kind of tricky, it has 3 layers in order to give it the elastic component.
From back to front:
Layer 1 Mylar Backing
Layer 2 Secret Stretchy Stuff
Layer 3 Actual Vinyl or Film
Cut through the first two layer, down to the mylar. Then follow this tech sheet: If you have any questions give me a call or post it
SPECTRA™ Elasticut Tech Sheet