Made this guy. 4 inches tall
The methods I use are the ones taught by the Shiflett Brothers.
The wire is cloth covered floral wire.
Then after that is posed, I use Oatey epoxy putty on top of the wires. It's a two part epoxy used for plumbing. It sets in about 5 minutes, so very little working time.
Once that is fully set, maybe an hour later, you can wipe a small amout of vaseline on it (very light amount) and then you can apply polymer clay to your rock solid armature.
If you want to cook it, and then reapply some more polymer clay details, just wipe another very thin layer of vaseline. The fresh clay will now adhere to the cooked clay. This can be done over and over again. I usually cook three times.
For more info, look up the Shiflett Bros. They know all, and will tell you what you need to know! Or ask me anytime.
Here are some picture examples of the epoxy, then clay going on.