"I always had the impression that the Red River Zeppelin Semi-Gloss was a dye compatible paper and not usable for pigment printers, you confirmed that."
You may be right Enrst, I checked and the 130 is dye-based and the Z2100 is pigment. The paper in the Zeppelin box lists different paper selections in printer for Epson dye or pigment inks, but doesn't say on the HP. They only list a couple HP's that I don't know what they are and the 130, nothing about the Z2100 so it probably doesn't work in that.
Thanks