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do u use toxic free glue for sand coating plaster?i mean so that the sand stick on the plaster.
 

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It shouldn't matter unless you have a pet or a child that might ingest some of it. A layout, once it is completed and all adhesives cured, should be essentially inert and harmless. Only if pieces are broken off and ingested would there be a worry.
 

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I use diluted acrylic matte medium. It's not toxic, but I wouldn't eat it... But I agree, it doesn't matter once the layout is complete.
 
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