Still haven't had any takers on the Fimo but in researching ways to condition old clay (because we must all be frugal in these times, yes?) I stumbled upon this website. All you old hands at polymer clay use have most likely visited this site many times but for those few (like me) who are somewhat new to this endeavor, I thought I'd pass it along.
Garie's Place (just click on the name)
They test all these products in various ways and post all the results. It's quite extensive and I found it very helpful. Their tips were interesting and I liked how they compared different brands and tested post-baking strengths, giving ways to strengthen the clay during conditioning.
I think I'm becoming partial to the "rubber mallet" approach....
Traveling Boxes Again ...
16 hours ago