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Old 09-05-2019, 09:16 PM
jgragg jgragg is offline
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Default Re: Loctite 5512 vs. Dow Corning 732 vs GE 2

Older silicone will sometimes not cure and it's just not worth it for something that is so cheap and easy to replace.
Gospel Truth here. Don't mess around with old silicone. You can have a horrible, horrible mess to clean up. When it just sits there and remains sticky and stinky - man, that sucks. It's one thing if you're just trying to join glass to glass and can pull the panes apart, wipe down, and start over. But if you put it inside a partly-built viv, got it on your cork or driftwood etc? Horrible.

As for what is safe to use, there are some known options. If you just need clear, my big box stores still sell GE 1 (which is safe because it doesn't use an organotin catalyst). You can also buy ASI Aquarium Sealant for cheap online and it comes in clear or black. I have had great luck with CR Lawrence black silicone, too, and it is relatively inexpensive. I use clear anywhere it won't be seen and black for anywhere it will :-)
I can also speak for the clear GE1 and the black ASI. My personal "rule" for color is the same - clear behind the scenes, and black anywhere I might have to look at the crap. I really, really, really don't like looking at silicone in my builds.

Good luck!
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