Store in an Air tight container, not the original container. I use a zip lock in side of a tupper ware container. You can also buy little round disc, (terra cotta I think) that you soak in water, wipe off, and store with the sugar to keep the molasses hydrated. I've never used one, but are said to work. I've heard that refrigeration helps as well...
There is only one Quality worse than Hardness of Heart, and that is Softness of Head.
Kool-Aid...Think Before You Drink