Even the cheapest plasticine is good. This stuff will never dry, so needed to be transported carefully back from NZ, and dusted regularly! I tried putting the burger in the over, but it just went soft, not hard. I think the solution is a layer of clear varnish. I’ve also been given the tip that sculpting with tin foil and then a layer of plasticine on-top saves your stock of plasticine.
Here’s some silly things I made. This brought me lots of flow and is a great thing to do if weening yourself off watching too much TV!