If it's peeling up then either you didn't heat it enough and apply enough pressure when applying the vinyl, or the surface you have applied it to is not suitable for a wrap,
When wrapping with this kind of material, you should be heating it to conform to the shapes, then once you are happy with it, it needs to be post heated to between 60-90C.
If you haven't wrapped it correctly or the material surface is too rough, you will definitely see it here as it will lift or bubble where air remaines trapped or where you have stretched the material too much. (if you stretch the material too much you also spread out the adhesive on the backing leaving less adhesive per cm2, hence less stick)