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i have some but am worried about leaching. if i coat them 100% in say clear silicone (or anything else anyone can recommend) what do you guys think.should they be ok?

there used to be a great link on how to make rocks in the old forum.....i think it was playsand and portland cement combination.
 

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Clear silicone would be kinda um.. ugly over a period of time .Also would be a bit difficult to get on evenly . IMO :D

But what would work well is weldbond wood glue

http://www.weldbond.com/products

Goes on easy with a brush. You can thin it down with water if you like.
I have contacted them in the past as I saw it was potable water safe when dry.The guys said the only issue would be ,over a period of time ( a year or so ) water could work its way under the edge of it. Where the glue stopped. It would be minimal and show up as a white line on the edge.To avoid this try to cover the entire object or at least beyond what shows.
You can pick a gallon up cheap and water some down and dip it in .:D works great and dries Crystal clear.
bill
 
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