Materials What is the smoothest air dry clay?

Another possibility would be epoxy clay -- Apoxie Sculpt, Amazing Sculpt, etc. It will definitely stick, and it's smooth. It's more 'floppy' than Sculpey, but if you're sculpting on top of something, that doesn't matter as much.

 

I would like to add a question if you don't mind: which air dry clay has a neutral or natural odour? I've used DAS clay once because I wanted to sculpt something with a child, and it smelled really chemical. The kid repeatedly put a piece of clay to the tip of his nose and smelled it. I've bought another "no-name"air dry clay from a local shop here and it was smelly too.

Would be great if someone could refer to that aspects aswell. I also made similar experiences with DAS like Elizern has described...

 

I prefer Milliput over Aves actually, I started with Aves first and bought Milliput only recently. Aves is by far stickier and don't smooth as easily before it dries- Milliput is like silk comparatively. Now that said, if I was covering a big, rougher area I'd probably use Aves as I think it's less costly.

 

LaDoll Premiere is very smooth, but it doesn't look like polymer clay. It's more of a matte finish. I'd vote for Apoxie or Milliput. Apoxie is less expensive.

Nike, La Doll regular or Premier have very little odor. A little bit of "wet paper" smell. Apoxie smells like stale tortilla chips.