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Red modeling clay , long term use ?

The red modeling clay sounds like something that may prove to be just what
I needed as a cheap alternative to laterite, however, I am wondering what
the long term consequences of its use?  Would the clay be a binding agent
to the gravel and produce a muck that would take forever to remove?  Is it
better to use this as a baked pellet form or in its more moldable state? 
If it is to be baked, at what temperature to allow some of this to be
broken down.  Does one just use this once and that's it or does one need to
refresh it every few years or for every new plant?
I am new to this and I don't know that much about soils and minerals.  I
couldn't find anything in the FAQs on this.

Jeff Chow