Digital BW, The Print

Since you didn't say which type of dry mounting, I'll go ahead and give 
my thoughts on both.

If you're talking about adhesive (transfer or pre-stuck) the 3M is 
generally preferred.  BUT, any "pre-applied" adhesive is deadly.  I 
worked for a major historical society in the past and have dealt with 
photo conservators.  "Acid-free" is not the only issue.

 From a heat mount standpoint I'd ask what their mounting temperature 
is.  Keep in mind that inkjet papers should never be sent through a 
laser printer because the coating could melt; likewise some pigments. 
Lasers (generally) run at 400-deg F; some dry mount presses get close to 
that.  Considering that paper only passes through the fuser at about .10 
of a second, leaving a print in a hot press for significantly longer 
could be as bad.

Hinging is the accepted way to mount art.  Anything from linen tape to 
mulberry paper/rice paste.  A lot of places (Michael's, Hobby Lobby, 
etc.) now use what they call photo mounting tape which is a white 
masking tape.  They just tape the art to the mat.
Actually, hinging will keep the art flat since it can move with changing 
temperatures and environmentals.

Of course, you didn't use the terms archival or longevity, so I may have 
gone overboard.

Seth

-- 
If I agreed with you both both of us would be wrong.