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Old 09-20-2003, 04:32 PM   #1
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Resealing Tank(s)

You see the tank of your dreams and the person selling it tells you its sprung a leak. You buy it cheap and decide to fix the leak... Well lets get started.

What you will need:
1. Bottle or tube of 100% silicone, your able to pick these up either at your local HD, LFS, or your nearest Home Improvement Center.
2. Razor Blades (caution very sharp)
3. Bottle of Rubbing Alchohol and cotton swabs.

Ok you have every thing you need so lets get started.
First you will need to fill the tank so you know where the tank is leaking. Gradually fill the tank (outside so you dont get a mess inside) filling it slowly will help determine better where the exact location of the leak is.

Second empty the tank and leave to dry. Take a razor and slice down the middle of the silicone press firmly it will be fairly difficult to remove. Then take the razor along the edges firmly and peel the silicone away. It may flake or crumble. Remove all the silicone above and below the leak about 3 inches. Make sure you remove the old silicone as good as possible and try to remove as much from between the 2 panes of glass as you can.

Third you will have to clean the area that the new silicone will be applied. Either use a vaccum hose to suck chunks from the area or wipe extremely well. Next take the rubbing alcohol and dab the cotton balls and wipe the area generously. Use a dry towel to wipe after. Repeat this a few times then let the rubbing alcohol dry and evaporate.

Fourth apply the new silicone to the seam use a decent amount and dont be to stingy. The silicone will begin to become very sticky in about 2 minutes so you will need to be quick. Next use your finger and rub it along the silicone lightly. Rubbing your finger will help spread the silicone along both sides of the seam and give you a better look. When appling the silicone to the already exsisting silicone (the old that you didnt cut out) apply it over the top of the old and smooth it flush. This will ensure that you dont have a seam that would be weaker between the old and new silicone.

Now all you have to do is clean any excess silicone that may have got onto the glass or smoothing the seam a little. Just use a damp cloth or towel to do this. Now just leave the silicone to cure, it should say on the silicone bottle of the cure time. Usually around 24-48 hours.

This is what i have done for resealing tanks and hasnt failed me yet. HTH all of you! Good Luck.
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Old 09-20-2003, 05:47 PM   #2
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A wet finger will help you smooth out the silicone easier.

..Won't it?

be less of a mess to.
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Old 09-20-2003, 05:56 PM   #3
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Good point, William...well, I don't know...I've never done this before! But I'm going to keep these instructions because my tank's silicone is stained from medicine, and someday I'll want to fix it. But...doesn't the silicone have to stay dry until it cures properly? So your fingers should be dry too??
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Old 09-20-2003, 08:10 PM   #4
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I have heard both ways actually keep it dry to help it cure properly is what i think.
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Old 09-21-2003, 01:00 AM   #5
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water on top of the silicone won't affect it, however, water between the silicone and the glass it is supposed to be adhering to will effect the integrity of the joint.

you can also use 90% isopropyl alchohol instead of water, that way most of it quickly evaporates when you're done smoothing.
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Old 09-21-2003, 01:34 AM   #6
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Neat, I got a tube of clear MARINA aquarium sealant, and it tells you in 4 languages not to put it in your eyes, how to open the tube, and what it will adhere to. No mention of the cure time

Assuming 24hour will do. Using it to glue tank divider guides into 15gal tank.
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Old 09-21-2003, 06:05 AM   #7
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Most sealant take few minutes to 'skin' and another 24 hours to cure.
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Old 09-24-2003, 02:06 PM   #8
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I would recommend letting it sit for at least 24 hrs. no matter what the tube would say just to be on the safe side. DIY is this what you wanted for a sticky on resealing tanks? HTH
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Old 09-24-2003, 04:44 PM   #9
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Okay, so what if you want to tear out ALL of the sealent and not just a portion?
What would be the best way to do this? Should I start with one side, cure, and then the next.. taking like 4 days? Any ideas???
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Old 10-10-2003, 01:36 AM   #10
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cuting old

Do you have to cut out the old seal or could you just reseal over it??
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