Re: [ATM] start...tool....

[Charles Mitchard <charlesmitchard@iinet.net.au>]

real plaster of paris is ok, wall plaster isnt, dental plaster is 
excellent, cement works but I dont trust the sand grains.
Dental plaster comes in a few grades depending upon what is required but 
can be expensive. (you must follow the directions explicitly for best results)
However, names and compostion of these products varies around the world so 
get what you can and see if it melts or dissolves in water. If that happens 
use something else.
Charles


>Saqib Sajjad wrote:
>
> >
> >first...i am thinking of making the tool with plaster of paris.
> >is it ok? is there any better choice? any suggestions?
> >
> >
> >
>I have never tried that but I think you must seal it.  It will come
>apart in water.  You can do a quick test your self to see.  I think
>dental stone is something like plaster of paris with Portland cement
>added.  I think the ingredients for some products like hydro-stone have
>been listed here.  You could check the archives.
>
>One of the Ken's.....
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