The block face must be resealed with a thin layer of OCT, rub some across
block face with thumb, or even tongue depressor (sp?) wrap in foil, and go
back to -80 freezer.  It works for us, some blocks are years old, and still
cut perfectly.  


Gayle Callis
Veterinary Molecular Biology
Montana State University - Bozeman
Bozeman MT 59717-3610

406 994-6367
404 994-4303 (FAX)