I want to make some stopmotion video's with clay, i used playdough (clay for little kids) but after a while it gets hard and white, so i was looking for other clay's to use. Then i saw allot of people use Van Aken clay but in Europe we dont have that clay (At least were i live) so i sent a mail to my local hobbystore and they said Fimo clay is kinda the same but it gets hard when you bake it so it should work good, but then i saw a video on E-how or whatever site and it said you shouldnt use clay that gets hard when baked in the oven. So now my question is, does Fimo clay works for animating and does it get hard after a while?
There isn't an easy answer to your question.
It depends a bit on the project you are anticipating.
I started using Fimo, and got somenice results. The negative of plasticine is that it will become very soft when exposed to lights etc. Fimo don't have this problem. But if you are starting a long project then you will have the problem that it will harden a bit, but only after some months.
Nowadays a use Fimo in preproduction to bake forms, shapes and limbs etc. that are meant to stay hard. In Holland were I live, there are a lot of hobby shops that sell good plasticine. I cannot imagine that there isn't one in your country. It doesn't have to be Van Aken :)
Use Newplast. Fimo doesn't have great flexibility and when it's baked it breaks and crumbles easier than it should. I only used Fimo in it's baked form for teeth and eyes, but Sculpey works much better.
With Fimo and other polymer clays, when you get a piece that hasn't been touched for a while, you have to knead it to condition it - to make it soft and easy to model. But when you stop working with it, it soon goes firm again, and it can easily tear and crumble. It is not baked hard, but just "rested" from sculpting. It just isn't easy to bend it without it breaking until you knead it some more. At least, the old Fimo that I used in the past is like that. So I don't know if animating it would keep it soft and pliable or not. I suspect it would not work well but I haven't tried it.
I have used baked Sculpey polymer clay to make hard parts, between the joints, but have not tried to use it when it is still unbaked. The usual material for clay animation is plasticine.