I am amazed at all the different remedies for sealing pouches.
When in doubt just use good old rubber cement.  It worked for
a hundred years.  Personally I have been behind others that have
used who-knows-what.  Nothing works as well or as long as rubber
cement.  Period!

Don Teach
Shreveport, Louisiana

 [ Thinned rubber cement becomes a pliable film (latex?) on the
 [ leather surface which stops air flowing.  Other leather treatments
 [ include various oils which fill the pores.  Some information
 [ is at https://en.wikipedia.org/wiki/Rubber_cement  and MMDigest
 [ articles are at http://www.mmdigest.com/Archives/KWIC/C/cement.html 
 [ -- Robbie