Anyone use urethane glue in their tanks?

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Oreo

Feeder Fish
MFK Member
May 7, 2008
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Baltimore
Hey y'all, I'm in the process of making a foam / cement background for my tank & noticed that the silicone really doesn't do a very good job of sticking to the foam. I saw a caulking tube of urethane by a company called PL. Far as I know, when urethane dries it will not leach & should be fish safe. Any word on if this will stick better to the foam? Glass?
 
Urethane glue dries looks like foam when it dries correct? I would think it would be OK to use.
 
I used great stuff to glue my styro together. I also prefer to embed some dow rods or tooth picks into the two pieces as well.
 
Urethane dries & looks like rubber. This is not a foam I'm talking about. I'm just curious if it will stick to foam. Anyway I bought a tube of it. I just need to try it out now. the silicone is totally craptastic. Really sorry I used silicone at all on the polystyrene foam.
 
GE makes an adhesive specifically for styrofoam. It is sold at HD and Lowes (in a blue tube). It is kept with the other construction adhesives.

Btw, when the cement coating is cured, it would be best to melt the foam out using a torch so that you don't have stress issues due to the boyancy.
 
Oreo;2418632; said:
Urethane dries & looks like rubber. This is not a foam I'm talking about. I'm just curious if it will stick to foam. Anyway I bought a tube of it. I just need to try it out now. the silicone is totally craptastic. Really sorry I used silicone at all on the polystyrene foam.

Craptastic denotes the social and cultural significance of unfettered crap, that is, pop-cultural productions that are judged to be without merit ...

Intended to be perceived as fantastic, but actually perceived as extremely poor quality

A portmanteau of "crappy" and "fantastic"

Help me understand; are we saying that the silicone doesn't work?
 
There are thousands and thousands of different "polyurethane" glues, paints, fillers, foams, and so on, just like there are thousands of silicones. The only way to tell if it's fish safe is to a) check out the MSDS, which may or may not help, and b) try it out.

My experience has been so far that a lot more stuff is "fish safe" than people think. But then again, it only takes once... so you make the call.
 
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