"Many customers "double strike" their translucent material to help the image from becoming "washed out" when the material is lit. On light boxes with very bright bulbs (typically when the box is very high off the ground) you can print the image on clear vinyl, and apply the same image directly on top of it, printed on white translucent, for the greatest "pop" from the colors. If you are using a clear substrate, and getting "hot spots" of light, try adding diffuser film to the back of the substrate. It will help even out the light diffusion and give you a more even tone."
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Avoid double striking translucent materials, this can cause premature failure of the graphic due to over saturation of inks, not to mention darker daytime colors. Instead, try printing the image on clear and apply it to the sign face first, then apply the laminated translucent print on top of that."
"It is recommended to let printed graphics out-gas for a full 72 hours before lamination and applying. This will help prevent edge-curling once it is applied. For graphics that are die-cut, it is recommended to leave ¼" of unprinted media all the way around the edge."