This is how it's done!!

As far as I can discern, this is probably Mr. Ryuji Kii (the proprietor of Amapro Toys).

 

HP - you're right on the money with Amapro Toys.

It's a messy site, but this is where I stumbled on the above link:

http://amapro.hp.infoseek.co.jp/

One of the links off the above page takes you to this toy shop where I think I found the kaiju painter.
http://www.amazing-toy.com/index.html

Other links off those pages show molds getting filled with concrete!! Will try to find them.

 

And how to stop the production:

http://amapro.hp.infoseek.co.jp/kumonga.html

http://amapro.hp.infoseek.co.jp/kamakirus.html

 

Maybe they're just doing a special limited cement version.

That would be a hell of an EMS bill!

 

I think Sunguts kills a figure like that. I think it's a nice touch.