Epoxy Resin and SprayFoam Question - The Planted Tank Forum
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post #1 of 4 (permalink) Old 05-17-2011, 03:25 PM Thread Starter
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Epoxy Resin and SprayFoam Question

I'm making a rock/cave formation for my tank. I plan on supergluing/siliconing rocks to an upside-down tupperware container. I'll obviously cut holes in the container to create the cave openings and shape the rock around the openings. My question is that if I use SprayFoam to fill in the empty spaces, do I need to use an Epoxy Resin to seal the SprayFoam, after it hardens? I read somewhere that I do. If so, what kind of Epoxy Resin would you recommend? I've been searching and cant seem find anything that fits the description of what I need. Thanks.
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post #2 of 4 (permalink) Old 05-17-2011, 03:47 PM
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Not sure on the epoxy resin, I think you will want something on the spray foam as it down not look overly natural. I have seen people use tile grout over spray foam... like this tank https://www.plantedtank.net/forums/ta...-solution.html
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post #3 of 4 (permalink) Old 05-17-2011, 07:31 PM Thread Starter
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Good point. I actually planned on crushing up some of the rock I will be using and coating the foam with it. The foam I'm getting is black and the rocks I'm using are black lava rock so, it should match pretty good.
I just dont know about the Epoxy Resin. Anyone???
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post #4 of 4 (permalink) Old 05-17-2011, 08:40 PM
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I have heard people using WEST System Epoxy resin, its pricy though.

You definitely need to seal the foam.
Other options include

Get clear fish safe, clear silicone and paint it on in a thin layer over the foam.

Drylok, you can pigment it with cement coloring. Paint it on over the foam.

Cement, down side to the cement method is you have to soak it for days to reduce its effect on your pH. The cement will raise you pH if soaking isn't done before putting it in.
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