Don,
I don't know anything about dry mounting in general, and the Seal 210M in particular. However, if the process involves heat, I would be cautious. As you are no doubt aware, the Kodak 1400 is a dyesub printer. As such, the prints are sensitive to heat, as heat is used to transfer the dye from the ribbon to the paper. If you apply too much heat to the image area of the print, the dyes will migrate, causing "smearing" of the image.
There is a page on the Kodak web site that discusses how to safely dry mount a Kodak thermal print. You'll find it at:
http://www.kodak.com/global/en/servi...34.3.166&lc=en
Bob Collette
Eastman Kodak Co.