There are hundreds of different binders (what you need to add to sand to make it suitable for casting) with some backyard guys swearing by their own mix and industry moving away from green sand to phenolic resins or oil sands. My requirement for the casting sand is simple - I get my sand from the local river and I need to put it back into the local river without polluting the ecosystem. Alternatively, the sand will go on my grass or the veggie garden. I also want the sand to be reusable.
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