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Need some plaster or some such product thats going to ultimately be underwater (Aquarium) will dry hard as a rock after shaping and will accept being painted before immersion,
What product should i be looking for?
Concrete or hydraulic cement. Be aware that there may be a period of curing and leaching that changes the water chemistry. I think that a safer idea would be to carve out some limestone or coral rock. (IIRC, plaster contains gypsum, and gypsum hydrates, so not a good choice for water stuff).
The cement is going to be shaped,thoroughly dried and painted before it ever goes into the Aquarium or i should call it a paludarium.
Something like this is what i'm striving for= https://www.google.ca/search?q=palud...HWBu4Q_AUIBigB
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