When stenciling a 2 part overlay design onto a cookie be sure to see how the 2 stencils fit together before airbrushing the design on your cookie surface. 2 part overlay stencils leave space on each stencil sheet for the other design. It would be helpful to see how these two designs line up on the surface of the cookie as well. To begin airbrushing the design, start with just one stencil design. After the first design is stenciled, lay the second stencil design in place over the previously stenciled section. There will be a gap in the design where the second part of the design will fit nicely. Stencil the second design.