Polyurethane Spray - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 09-06-2016, 07:12 PM Thread Starter
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Polyurethane Spray

OK guys I'm going to build a 3d background in my 36g bowfront for my Bristlenose pleco, I would normally just use pink foam and carve it into rocks and drylok it, But this background I am building I need to make look like a muddy river bank so I need a spray to be able to seal in the sand particales and to get into the crevices a paint brush can't get into. So that is why I can't do epoxy either.

So I am wondering if any brand of polyurethane is safe once it is cured and what is the best to use.

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post #2 of 7 (permalink) Old 09-06-2016, 09:24 PM
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That's an interesting question, so I'm going to follow this thread.

This does sort of beg the question could you place the background behind the tank? That way you need not worry about the material being toxic. It might be possible to light the background so you don't notice the rear glass too much. Just a thought.
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post #3 of 7 (permalink) Old 09-06-2016, 10:08 PM Thread Starter
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I don't like placing the background behind the tank as I like for the fish to use it, Plus the back of the tank is already painted black, Because my pleco loved driftwood this background will have a few pieces of driftwood sticking out from it, to kinda mimic tree roots sticking from the eroded sand bank. At least that is what i am going to try to accomplish. And So I have seen someone on youtube use miniwax polyurethane on his 3d background. and had no problem with his fish, But I guess I just want to make sure before I get any type that it is safe once cured.

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post #4 of 7 (permalink) Old 09-07-2016, 12:45 PM Thread Starter
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Does anyone Know what is safe?

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post #5 of 7 (permalink) Old 09-07-2016, 12:48 PM
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I don't think polyurethane is safe, there's water based and oil based so... idk if they leach or not, what kind are you using, oil or water? polyurethane is water proof, but... idk im sure there is a safe version
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post #6 of 7 (permalink) Old 09-07-2016, 01:51 PM
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They do make epoxy clear seal. Poly is probably safe once cured but epoxy is stronger.


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post #7 of 7 (permalink) Old 09-07-2016, 01:51 PM Thread Starter
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At the moment I aint using any. Trying to figure out what others have used, and know to be safe. But here why I think some are safe. once it is cured it should be a solid plastic, And they are used on tables and other food contact items, and I have seen others use them on their backgrounds so some would have to be safe, It is just which one? and what brand? And most foams including great stuff is made from polyurethane. and we stick those in our tanks. but I need somthing that is a Clear coat. that can be sprayed on. and fish safe.... regardless of what it is. (wish i could do epoxy)

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