Digital BW, The Print

If you're not overmatting, one solution that I use a lot is to hinge
mount from the top with a Japanese hinging paper or, for large or
heavy sheets, a linen hinging paper. Lineco makes both types, with a
water soluable adhesive. You can use a T-hinge, float the print in a
deep frame and the hinge is not visible. This allows the paper to
breathe and expand without signs of buckling.
-- 
amadou diallo
Author, Mastering Digital Black and White
www.masteringdigitalbwbook.com