Hi Keith,
Dry mounting is just fine, or wet mounting is fine. The problem is NOT with the method of mounting as much as they do not like the idea of a .008" thick 3.4" x 4.2" print being mounted on a larger sized 3.5" x 5.5" .008" thick backing card. I surmise that the .008" step of the print on the backer might cause a problem in their sorting machines. So what I've done is mount a 3.5" x 5.5" decorative border on to the backer. This border is .008" thick, the same as a P-roid print. The center of this border is cut out in a 2.8" x 3.7" window. I trim the white borders off the P-roid print, making it 2.8" x 3.7", stick it to the backer in the window cut in the decorative border. This way the P-roid is in a decorative window mat and NOT sticking above the surface of the larger post office approved size card. A lot more work, but it does not stop me from sending a P-roid postcard.
Sam H.

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