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Old 02-24-2014, 11:37 AM   #1
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40 yr old empty large tank???

I have a 40yr old 65 or 75 gallon tank that has been empty for about 35 years at room temperature ( not stored in garage ). It's glass with clear sealant at the seams. Right now, I cannot get to it to inspect it b/c I will need help pulling it off the lower shelf and onto the stand. What are the odds that it might hold water and not leak?

Is there a way to test for leaks without filling the tank up?

I went to LFS and asked for a price to clean and set up the tank and they told me I had to set it up and test for leaks 1st. Obviously, I won't need them after I get the required help to liberate, clean and fill the tank.

I'm worried about a 75 gallon flood.

Can new sealant be placed over old sealant? Or does old sealant need to be completely removed?
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Old 02-24-2014, 11:42 AM   #2
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When I got an old used tank I put it outside, filled it up and put food coloring in it so I could see where the leaks where if there was any leaks.

And of you do need to reseal it I would take as much of the old stuff off so the new sealant will have direct contact with the glass.
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Old 02-24-2014, 11:48 AM   #3
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Quote:
Originally Posted by IShallNtEatFish View Post
When I got an old used tank I put it outside, filled it up and put food coloring in it so I could see where the leaks where if there was any leaks.

And of you do need to reseal it I would take as much of the old stuff off so the new sealant will have direct contact with the glass.
Excellent advice. I completely agree. Leave it set-up for about two weeks. Also if you do have leaks, try and get it professionally resealed.
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Old 02-24-2014, 12:01 PM   #4
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Quote:
Originally Posted by IShallNtEatFish View Post
When I got an old used tank I put it outside, filled it up and put food coloring in it so I could see where the leaks where if there was any leaks.

And of you do need to reseal it I would take as much of the old stuff off so the new sealant will have direct contact with the glass.
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Originally Posted by Ian086 View Post
Excellent advice. I completely agree. Leave it set-up for about two weeks. Also if you do have leaks, try and get it professionally resealed.
+1 to both of these. The silicone may have dried up and become brittle over this ammount of time.

To get a professional to do it, its easier and well they are professionals. It would be really cheap too
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Old 02-24-2014, 12:02 PM   #5
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You should definitely remove the old silicone and put new on. It doesn't take that long and is the best insurance. I would still do a 24-48 hour leak test.
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Old 02-24-2014, 12:06 PM   #6
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Thanks! Where do I look or google for aquarium strip and reseal. My mom & pop LFS didn't offer that option.
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Old 02-24-2014, 12:07 PM   #7
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BTW. I didn't do my profile yet b/c phone app doesn't have that option, but I live in Chicago, IL.
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Old 02-24-2014, 12:09 PM   #8
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Check a hardware store it's made my DAP it's in a green tube.
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Old 02-24-2014, 12:09 PM   #9
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Here's a good one DIY Tank Re-Seal Full Instructions
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Old 02-24-2014, 12:10 PM   #10
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You can strip it your self if your up for the challenge. Just remove all the silicone from the inside of the tank if it doesn't leak after your test with a razor blade and goto lowest or home depot and get GE1 clear silicone and reseal it. It sounds very simple but striping is the hard part. You don't wanna dig the razor into the cracks where the glass is held together
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