DIY Tank - silicon turned white? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 05-29-2008, 12:39 AM Thread Starter
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DIY Tank - silicon turned white?

I am building my first tank, and it went ok until I test filled the tank.

I used DAP dynaflex 3.0 (Crystal Clear) sealant, and constructed the tank. After waiting 3 days, I filled it with water. I had a small leak in the bottom plumbing, but the tank seals were fine. I drained the tank after 2 days and the sealant that was under water the whole time turned white. The sealant above the water line is still clear.



Any ideas what is going on here? I thought 3 days would be pleanty of drying time. Should I just go ahead and tear it apart and try with a different sealant? (I couldn't find any of the sealants listed in the big DIY tank threads). Its only a 12x12, so I don't need super strong stuff. Any other suggestions?

Thanks,
Alan
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post #2 of 9 (permalink) Old 05-29-2008, 01:19 AM
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Try GE Silicone I for doors and windows? I think that's the one.
Make sure you get I, not II.

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post #3 of 9 (permalink) Old 05-29-2008, 01:53 AM
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Any GE 100% silicone will work fine.
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post #4 of 9 (permalink) Old 05-29-2008, 02:35 AM Thread Starter
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Thanks for the info.

As the silicone drys its turning clear again, so its obviously not meant to be submersed. I'll look for the GE stuff and retry. Its going to be a [email protected] to get all the existing sealant off. Good thing I'm not in a hurry!
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post #5 of 9 (permalink) Old 05-29-2008, 03:13 AM
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Beware of strong acetic acid smell!

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post #6 of 9 (permalink) Old 05-29-2008, 03:52 AM
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it would be much easier to use a chemical to rid the glass of existing silicone rather than using a razorblade by hand.


go to an auto parts store and look for a paint stripper in an aerosol can.
specifically, one i have experience with is called aircraft coating remover.
trust me, it works. it eats through anything that is not metal (or glass.)
this stuff will turn epoxy resin into jello. it will liquify silicone.

spray it on your silicone and stick the tank somewhere where it can (fall apart) safely. like outside on the grass on top of plastic trash bags and newspaper. unless you want to kill your grass.

just spray it on, wait 10 minutes, the silicone will start bubbling up and start coming off. it will loosen up the whole thing and you will be able to pull it apart and wipe off any silicone left with paper towels.
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post #7 of 9 (permalink) Old 05-29-2008, 05:19 AM
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So it will eat through your hands?

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post #8 of 9 (permalink) Old 05-30-2008, 06:39 AM
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Quote:
Originally Posted by tropicalfish View Post
So it will eat through your hands?

the stuff is very irritating to skin. if it sits for a little while on there it will start to burn. i just try to not touch it and if it does come in contact i just wash the hands as soon as i can.

the right idea is to wear gloves. use protection

who knows what would happen if you were to spray it directly on your hands and let it soak for 30 minutes.
-it would likely make your skin feel like beef jerky and peel off in layers.
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post #9 of 9 (permalink) Old 06-06-2008, 08:29 PM Thread Starter
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Well, acetone and razor blades seem to be doing the trick. I am getting ready to go on vacation in a week and have too much stuff to do to get to this for a while. I'll post if I ever get this thing together and on my desk at work.
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