Deanna - one of the first things that you can check is your benzoyl 
peroxide - is it fresh?  Have you completely dissolved the benzoyl peroxide 
before adding the hardener II?  In the humid summer months GMA will tend to 
absorb water and the blocks can be soft - I usually cover the embedding 
molds (we embed in Peel-A- Way molds) tightly with foil during 
polymerization and polymerize in a closed container in the fridge in which 
I also put a cassette containing Dri Rite (or any other dessicant).  If 
your blocks are soft you can also put them in a 37 deg C oven to 
harden.  Also, I store my polymerized GMA blocks in a closed container with 
dessicant.  Hope this helps!  


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