Dental Plaster Decorations - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 02-24-2012, 05:55 AM Thread Starter
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Question Dental Plaster Decorations

I have heard that regular Plaster of Paris would slowly dissolve in water and I am not sure about using hydrostone either for making molded caves and such but dental plaster is supposedly inert enough to be used underwater like making artificial coral reefs and more.

Imagine putting your creations in a tank and letting moss completely engulf them. A moss bonsai tree without the worry of tannins, etc.

I am asking if this would be worth trying. Also, where would I find dental plaster? The nearest arts and crafts store?
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post #2 of 11 (permalink) Old 02-24-2012, 06:02 AM
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Dental plaster is a bad idea, it dissolves in water and will affect your water parameters.

I'm a dental lab technician and can assure you dental plaster or gypsum is a bad, bad idea.
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post #3 of 11 (permalink) Old 02-24-2012, 06:17 AM Thread Starter
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Thanks for the professional words of advice (warning) Mordalphus. I originally saw this idea on AC and wanted to verify it here before proceeding.

I'm guessing that means I either have to buy unglazed ceramic decorations or find the nearest pottery studio with kiln?

Oh, well. Better safe than sorry.
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post #4 of 11 (permalink) Old 02-24-2012, 12:36 PM
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Some thing like this may suit your needs but I'm sure it is more expensive than plaster.

http://www.amazon.com/InstaMorph-Mol.../dp/B003QKLJKQ
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post #5 of 11 (permalink) Old 02-26-2012, 10:39 AM
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http://www.amazon.com/s/ref=nb_sb_ss...s-crafts%2C253 same thing PVC pipes are made from, just form it throw it in the oven to cure and go from there
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post #6 of 11 (permalink) Old 02-27-2012, 05:24 PM
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A good suggestion I have never tried putting any thing I have made from polly clay in the water but I can't imagine it would bother it as its plastic.
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post #7 of 11 (permalink) Old 02-29-2012, 05:12 AM Thread Starter
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What about mixing bathroom tile grout with sand or mixing cement with sand?

InstaMorph is biodegradable and I don't know how long it would hold up in an aquatic environment.

Polymer clays like Sculpey are considered non-toxic to humans according to the latest MSDS since they used to contain phthalates as plasticizers, but if it contains petroleum products then I wouldn't want to use them.
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post #8 of 11 (permalink) Old 02-29-2012, 05:15 AM
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You could make it out of dental plaster and then coat the entire thing in epoxy...
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post #9 of 11 (permalink) Old 02-29-2012, 09:25 AM
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You could also use quickcrete It'll raise the pH for a while but you can soak it till the pH settles, or paint it with Krylon Fusion paint (the entire surface)) wait 7 days and then its ready to go in the tank
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post #10 of 11 (permalink) Old 03-01-2012, 02:49 AM
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I was in Lowes recently, and they had an epoxy based grout.

Not sure how it would cure if it was cast into something, but it might work for something like this.

or you could always just mix sand and epoxy, I've used that for a few things, and liked how it came out.
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post #11 of 11 (permalink) Old 04-15-2012, 06:30 PM
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I made caves for my aquarium out of small flower pots. I bought them at a Big Box Store, then took them to the back & had them cut the pots in half on the wetsaw.

Once @ home, I took a file and rounded off the edges, so that there were no sharp edges, or corners.

Then, I covered them in silicone, and dipped them in the same grave that I use as a substrate in my tanks.

After the first application, there were still a few spots where you could see the terracotta color showing through, so the next day, I just coated them a second time

See Pics below.....


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Cheers!
James
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