The invention describes a method of printing onto a balloon that includes the steps of: coating the printable outer surface of a balloon with a primer material; attaching the balloon about a supporting substrate to form a balloon blank; flattening the printable outer surface of the balloon on the upper surface of the substrate; attaching a first tab on a first end of the balloon blank; attaching a second tab on a second end opposite the first end of the balloon blank; applying the balloon blank to a printer, via the first tab, which in use prints a first image onto the printable surface; and moving the balloon blank back through the printer via the second tab, which in use prints a second image onto the printable surface.