for prototyping your cut, i'd go with a starch-based water soluble adhesive like mod podge. for final application, what i'd do is get a pressure sensitive adhesive like krylon tack spray. the basic idea is that it can be a temporary or permanent adhesive depending on how long you let it sit on the vinyl before you apply it. if you spray and apply immediately, it's a temporary adhesive and will allow you to remove and reapply at will. if you leave it to dry for about 15 minutes, it becomes a permanent, pressure sensitive adhesive.