Perhaps it's our warmer and possibly more humid climate than some of you might have, but I've had no such problems with the Harman FB Gloss AL here in Hawaii. My printer is an Epson 3800. The prints sit overnight, and they seem to harden up just fine whether black and white or color. I don't spray them, or take any extra precautions in handling. I could scratch the surface with something like the edge of a screwdriver, but not by brushing it (I just tried that with a horsehair draftsman's brush - no marks whatsoever are visible even under strong magnification in reflections from a very close lightbulb - sorry).
Bad early batches??
I have more of a larger size on order. If I have any problems with it, I'll let you know.
Meanwhile, as mentioned, the blacks are superb, the colors cover the whole range from delicate to "blitzkrieg," and the smoothness and detail are the best I've found so far. The black ink curve starts as a smooth, straight diagonal line until it gradually levels off to its very impressive 2.46 dMax, and it exhibits no end-of-curve reversal or odd bumps or dips anywhere. So far, so good.
Aloha,
Aaron