Watertight Foam Sealant??
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Old 12-17-2014, 09:16 PM   #1
ecoguy1983
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Watertight Foam Sealant??


Hey all.

So I'm building a 3D vivarium environment using sheets of foam insulation about 1/2" thick.
I want a trowel on sealant. I was thinking about tile grout powder and sciicone.

Suggestions?
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Old 12-17-2014, 09:21 PM   #2
bsantucci
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Are you set on using sheets of foam insulation? I made a new dart frog tank and did my 3d background using great stuff foam pond and stone. It's waterproof and right after application I wore gloves and press coconut fibers into it. Came out great. Photo below.

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Old 12-17-2014, 09:42 PM   #3
ecoguy1983
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Well I am going for more 3D than that. I'm making a water section up fromt, about 15 gallons, and the terrestrial portion is a running stream. I have a 40 G cube.

I want to fit a lot in so cutting and control is important over large areas. So sheets seem like the logical answer.

Finally. I much prefer the sedimentary look over the lava look.
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Old 12-17-2014, 09:44 PM   #4
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I'd still go with the foam I'm suggesting. Once hardened it is cut VERY easily with a box cutter or whatever blade you want. You can create a stream using it as well, and once carved how you like, use aquarium silicone over it and use rock dust/fine gravel to stick to the silicone. This will create a paved type stream that is water tight.

If you're using a false bottom just let the stream run into an open area to create a pool type finish.

There's lots of great ideas for this over at frogforum.net.
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Old 12-17-2014, 09:53 PM   #5
ecoguy1983
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Thank you, but I am set on sheets.
I like the ability of building upwards with them.
It is very easy to make large flat areas which is what I'm going for.
A series of shelves to accommodate a falling stream and plants.
Every level is easily separated nicely at 1/2" increments.

So please. Lets stick to the question proposed and not the methodology of the construction before the point.

Silicone mixed with grout?
Or how about just with sand?

I've read you can cut it with thinners to make it workable.
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Old 12-17-2014, 10:14 PM   #6
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How about this mixed with sand?
http://bondo.com/products/fiberglass...resin-401.html

Its the same fibreglass resin used to fix boats.

But I know silicone is watertight.

Last edited by ecoguy1983; 12-17-2014 at 10:25 PM.. Reason: spelling
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Old 12-19-2014, 11:11 PM   #7
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I've done a couple paludariums in the past using sheets of expanded polystyrene. Coated it with an epoxy/sand mixture, and It worked out fairly well.

I haven't tried the silicone mixed with stuff, so I can't speak for that, but Epoxy is fairly easy to work with, and doesn't make half as much stink It also cures relatively quickly, and will stick to almost anything, so it adds a lot of structural strength to the styrofoam.

I've used epoxy resins picked up at plastic supply places, and I've also used the stuff you can find for making bar/counter/table tops - usually near the varnish/sealant area in hardware/paint stores, or in the sculpture/molding section of craft/art stores.

I'd avoid the fiberglass/polyester resin, that stuff is a bit trickier to work with, the chemicals can be pretty hazardous, and it doesn't cure quite as neatly/easily as an epoxy resin. The epoxy resin is more expensive...
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Old 12-20-2014, 01:17 AM   #8
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I did my paludarium with foam sheets as well. I chose to use drylok finished with spray can sealant. Has worked well for over a year. The pygmy corys and rcs keep breeding and the plants grow.
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