....spraylat is part water, so the older it is the drier it is.
In the sign business, we'd often mask an acrylic face, then not use it right away.....bad news. Often rolling on a thick topcoat of more spraylat would soften the first layer, and give a more substantial layer to pull on when peeling. If you dont' have more spraylat, try covering an area with masking tape, than may keep it from coming off in tiny bits.
soaking teh whole thing in water for a week might help, but it's almost impossible to peel when gooey.
any mechanical means will undoubtedly scratch the acrylic.
hope this helps a bit.....best of luck!