Peter, I used the process that Forms Labs recommends of washing in IPA (using two baths) and then leaving the prints to dry for some time. I didn't use any other post curing process, although Form Labs does detail some options here: http/formlabs.com/support/finishing/post-curing-prints/. It is definitely possible that these might make the parts tougher, but they still remain somewhat soft.
Very helpful review! I'm specifically looking for a 3D printer to product clear objects, and this one looks pretty promising. However, I'm wondering if the clear resin was truly white-clear, or did it end up with a yellow tint that some of these resins often have?