Variable printed UV curable adhesive retail signs

A method of forming a stack of adhesive signs comprising:

• providing a transparent substrate layer having opposed first and second surfaces;
• inkjet printing a first composition on the second surface of the substrate layer, the first composition comprising at least one of a photo-curable monomer and a photo-curable oligomer, the first composition having a first viscosity;
• after inkjet printing the first composition, inkjet printing a second composition to form an image layer on the second surface of the substrate layer, leaving at least a portion of the first composition, or an adhesive layer formed therefrom, exposed to the atmosphere, the second composition comprising a colorant and at least one of a photo-curable monomer and a photo-curable oligomer;
• photo-curing the first composition and the second composition on the substrate layer, whereby the photo-cured first composition defines the adhesive layer, the adhesive layer having an exposed adhesive surface and having a second viscosity higher than the first viscosity;
• each adhesive sign comprising the substrate layer with the photo-cured first and second compositions or comprising a sheet formed by cutting the substrate with the photo-cured first and second compositions into sheets, each sheet having an adhesive layer and an image layer thereon;
• and
• forming a stack comprising a plurality of the adhesive signs, whereby the adhesive layer of a first of the adhesive signs is in adhesive contact with the substrate of a second of the adhesive signs.