I have been having some issues with signing some baryta prints. I had no problem with the Innova but the ILFORD Gold Fibre Silk Baryta has given me fits. On well aged prints, say 6 months old I have no problem but on fresh prints even two weeks old and open to the air the whole time many pens just skate on the surface or skip. I just did a test. Soft pencil won't work on either. On the 6 month print both worked fine but on the two week print a Sharpie wouldn't write at all and a Rapidograph (my preference) just skated and skipped. Any suggestions? I am not interested in signing the mat.