I found out if your clay is hard 30 seconds on defrost in the microwave softens it- if its still hard turn the block over for another 30 seconds- I have arthritis, so its hard to condition the clay manually, this is a cheat i discovered-
it worked on stale 2oz blocks of sculpey and fimo- microwaving vibrates water molecules, creating friction- same thing manually working it would do- warms it up. you stil have to condition it by hand a bit, but it makes it easier-
Please be very careful, the first thing the company all say is DO NOT MICROWAVE. there may be other reasons, along the same line if you take the hard to work clay and throw it on a firm surface like the floor, with something safe on it you might vibrate those molecules also!!! putting it on a low heating pad, put it in a plastic bag and float it in hot water. or take the hard clay and work it with really soft translucent clay these are worth trying. but please be careful with the microwave it truely scares me.
I have to agree with Leigh,
while I haven't tried it myself, as I scientist I can tell you that microwaving clay can damage the plastic molecules are release harmful toxins
please ventilate when experimenting
Thanks for the concern, the companys concern is people poisoning themselves with fumes- lawsuits- microwaves create hot spots, and burning polymer is toxic- but you could do the same in a conventional oven- and i have- firing it too hot- i found other people who defrost nuke their clay for 15 seconds- its not even enough energy to thermoset it. But i will be careful.