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I have a strange issue with White Overflood modes (no matter the white ink density). As seen in the attached images, the printout appears grainy (seen from the adhesive side of the media). I used our microscope to see the ink particles in more detail and it appears that the CMYK ink is "repelled" from certain areas and the white layer becomes visible underneath it.
I have this issue when printing in WOF (100, 160 and 260) and 5LWSW mode, but only on the adhesive side of the 2-sided stickers. I tested WUF and CMYK only modes on the same media (transparent sav monomer/polymer) and the printout was perfect.
Can you suggest ways for further troubleshooting?