I've never tried MonsterMakers clay so I cant comment on it in any way but I am a firm believer in what Chavant offers.
Chavant
They have a lot of different clays...whatever your 'feel' for clay or use for it they have a clay for the job. It's all about your comfort level and what you need to use it for.
Personally, I really like Chavant NSP soft...I use it for organic sculpting and mechanical sculpting too. Retains great detail, easy to get smooth...great to work with.
Soft is pretty soft...never used anything else other than their Y2Clay which is pretty firm for my abilities...but like I said, they do have a clay for all your needs.
Still, MonsterMakers has a great name in the industry so I'd work that for a bit and see how you feel with it. :thumbsup
David
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