<< 
 Bernie, would you tell us what gesso sizing you were using for gum.
 Puleeze!?
   Cheers,
 
 Judy
 
Currently I am using Liquitex Gesso not so much that I think that brand is
better it is just what they carry down at the Art Store.  I am never found
the brand to be that important but the dilution to be critical.  Not enough
and the gum coat will float off the paper.   Usually I can tell if the paper
is oversized when I am coating because the pigment doesn't coat well.
 Sometime with blotches that are very difficult to brush out.  
I remember from our previous discussions that gesso sizing is not one of your
favourite things.  And I must admit that for most of my work I use gelatin
sizing.  However, recently I had to finish 12 prints in less than a week for
a client and I didn't have the time or the paper to gelatin size so I pulled
out the gesso and was printing within hours of purchasing the paper.   
This may be beyond the scope of your question but I dilute the gesso with
water until I can coat the paper evenly using a foam brush.  I hold the paper
up with a light shining through it to check the eveness of he coating.  If
the coating looks a little blotchy then I add more water.  As a last step I
will usually buff the paper slightly with a lint free cloth.  This seems to
remove the grittyness that I sometime get with gesso sizing.  
And last but not least I don't expect great things from the first coating.  I
seems to settle down after that.  I know some of the books say to sand the
gesso sizing but I never found that to help me.
Take care,
Bernie
Bernard Boudreau.