Hi Paul,
Some of this was discussed just before new year here:
http://www.warmglass.com/phpBB/viewtopi ... =7&t=27066
I think on page 2 there is my recipe for kiln sand casting...
If you want the sand to stick to the glass, just do not add anything for separation.
As for sea/river sand; yes - you can use it but pre-firing it to about 600C/1112F will spare you the unpleasant surprises.
Lucho
Tech needed for casting leaving a sandy skin.
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