View Full Version : Old Silicone?


trigger-happy
01-10-2010, 10:12 AM
Hey there, just purchased my first tank, been living vicariously through my S.O.'s multiple tanks for a while. Ended up paying $100 for a 55 gal tank + stand + equipment on Craigslist...and I think I overpaid, because the tank is filthy and needs some serious work, the stand is falling apart, and the equipment is missing parts.

However...I've decided to make fixing this thing up a personal project. I'm buying lumber to build a new stand and a matching canopy. The tank itself, however...judging by the design of the frame and the unusual thickness of the glass, along with the glass support brace in the middle of the top, I think this tank is probably from the 1970's...and it's showing its age. Namely, the silicone used to seal it inside and out feels dry and flaky.

So, here's my question: I know I need to re-seal this tank before I ever put water in it, but do I need to remove all of the old silicone BEFORE putting new on, or do I just go over top of it? If I go over top of it, will the old silicone interfere with the new creating a water-tight seal against the glass?

Thanks!

johnr2604
01-10-2010, 10:14 AM
yes, you need to cut out as much of the old silicone as possible.

trigger-happy
01-10-2010, 10:25 AM
yes, you need to cut out as much of the old silicone as possible.

Awesome, thanks.

weaglereefer
01-10-2010, 11:22 AM
Not as much as possible, ALL of it. The new silicone will not bond with the old silicone and you'll have leak city on your hands.

Ryuchi
01-10-2010, 12:05 PM
I just did this last month, take your time and remove all the old silicone ( the silicone holding the glass together in a tank that small should be fine ) dont be afraid to go heavy around the bottom seam where you wont see it anyway. use GE clear window silicone, dont use the one with anti-mold agents.

trigger-happy
01-10-2010, 12:10 PM
Will do, thanks, both of you. Extra thanks, Ryuchi - I was concerned I'd have to buy expensive, aquarium-specific silicone to ensure it was safe. Glad to know there's another option.

weaglereefer
01-10-2010, 12:14 PM
Should be "GE Silicone - 1" and around $5 a tube.

salt reefer
01-10-2010, 1:04 PM
hd also carries aquarium silicone pretty cheap to .

weaglereefer
01-10-2010, 1:06 PM
hd also carries aquarium silicone pretty cheap to .


I've only ever seen it in the small tubes, not the ones that fit in a caulk gun, and I believe the small tubes are like $8 (here anyways) so you'd probably spend 4-5x as much to use the "aquarium silicone".

trigger-happy
01-10-2010, 11:57 PM
Found the GE Silicone 1 at the Athens Home Depot for just over $3 a tube. Picked up two tubes to start, I've no idea how much I'll need. Thanks for you input, everyone.

johnr2604
01-11-2010, 12:03 AM
Not as much as possible, ALL of it. The new silicone will not bond with the old silicone and you'll have leak city on your hands.I should clarify my earlier statement. The reason I said as much as possible is because you cant take out the silicone in between the glass without disassembling the tank.

Rbredding
01-11-2010, 6:11 AM
you'll know if the silicone needs to be replaced the minute you start removing it...

if it's relatively easy.. it needs to be replaced, if it's mission impossible, it's probably been replaced recently..

I used a typical utility knife blade and put several wraps of tape on the top side, it made it easier to hold, but still chewed my fingers up pretty good...

RyanP
01-13-2010, 1:44 PM
Not to derail, but does GE sell the GE I in black?

bratliff
01-13-2010, 2:45 PM
Also, I read the label on the GE Silicone 1 and I swear it said "not for use below waterline" or something similar... can someone who's used this possibly post the SKU number so I can make sure I get the right stuff too please? There are many different types of GE Silicone 1 on the shelf at HD...

weaglereefer
01-13-2010, 2:47 PM
The cheapest one, no additives. I'll stop by HD on my way home from work and get the SKU if you still need it.

bratliff
01-13-2010, 2:52 PM
The cheapest one, no additives. I'll stop by HD on my way home from work and get the SKU if you still need it.

Don't wanna put you out, but, I spent like 30 minutes reading silicone labels trying to figure out what would be safe and actually work! If you are already headed to HD and can grab the SKU, that'd be awesome!:yay:

weaglereefer
01-13-2010, 2:57 PM
I was gonna pick up some 3/4" PVC bends for a jawfish burrow, and another 1/4" JG valve, so it's not out of the way.

RyanP
01-13-2010, 3:15 PM
hey au, if you dont mind...none of the home depots carry GE in black here, can u see if they do there? It would be much appreciated. BTW the lights still kicking.

weaglereefer
01-13-2010, 3:23 PM
I'll check on the black too, but I have never seen it.

RyanP
01-13-2010, 3:24 PM
I'll check on the black too, but I have never seen it.

Thanks :thumbs:

Rbredding
01-13-2010, 4:10 PM
I just went with All Glass Aquarium's Black aquarium silicone... it's only $10 / tube and you know you're putting the right stuff on...

weaglereefer
01-13-2010, 4:56 PM
Nope, no black. All of the silicones now say not safe for aquarium use. The ones I've used in the past did not say that. I don't know if their formula changed or what.

RyanP
01-13-2010, 5:18 PM
Thanks AU, i found some at Grainger that DAP makes that is FDA certified and is food safe. I would say that its fish safe too.

johnr2604
01-13-2010, 6:36 PM
Nope, no black. All of the silicones now say not safe for aquarium use. The ones I've used in the past did not say that. I don't know if their formula changed or what.Its been at least a year and a half that the GE silicone I has said not for aquarium use. I was gonna use it when I built a sump then and decided not to. Almost all household silicone is gonna have microban in it now. Try walking back to where the acrylic is at in a red tube you will see 100% silicone. This is what I used on cliffs sump and its been fine.

weaglereefer
01-13-2010, 6:51 PM
Its been at least a year and a half that the GE silicone I has said not for aquarium use.


That's about the last time I bought a tube, too, lol.

bratliff
01-14-2010, 7:06 PM
Nope, no black. All of the silicones now say not safe for aquarium use. The ones I've used in the past did not say that. I don't know if their formula changed or what.

So, it wasn't just me being stupid. :thumbs: Hmm... so, any other local stuff? I found stuff I can order, but, that really sucks when you run and need just one more tube! :shout: And that DAP stuff is expensive for how much you get.

RyanP
01-14-2010, 7:13 PM
im picking mine up tomorrow for like 6 bucks a tube

RyanP
01-14-2010, 7:14 PM
http://www.grainger.com/Grainger/items/4MY67

bratliff
01-14-2010, 7:21 PM
http://www.grainger.com/Grainger/items/4MY67

I hope that works, but, read the back label before you buy it. I swear HD carries the same stuff and it reads somewhere "not for use below waterline" or something similar...

RyanP
01-15-2010, 5:59 AM
I guess its a crap shoot then because the one everyone says to use GE 1 also says not recommended for aquarium use if you call them.

phil47952
01-15-2010, 8:03 AM
I guess its a crap shoot then because the one everyone says to use GE 1 also says not recommended for aquarium use if you call them.

I understand this to be a sealant and not an adhesive, I think there's a diff....Something to think about maybe..

Phil

RyanP
01-15-2010, 9:38 AM
I hope that works, but, read the back label before you buy it. I swear HD carries the same stuff and it reads somewhere "not for use below waterline" or something similar...

You were right, i got to the store and read the back. It said not to use under the water line. Cant find this stuff anywhere

RyanP
01-15-2010, 9:38 AM
I just went with All Glass Aquarium's Black aquarium silicone... it's only $10 / tube and you know you're putting the right stuff on...

Where'd you get it from?

RyanP
01-15-2010, 10:02 AM
Where'd you get it from?

I found it through glasscages @ $8

Rbredding
01-15-2010, 10:05 AM
Where'd you get it from?
online search for
all glass aquarium silicone... white tube with red lettering.. i believe its the 10oz size...

thik mine came off ebay.. but almost any local fish sponsor should be able to order you some..

RyanP
01-15-2010, 10:22 AM
yeah i just got off the phone with glass cages and they have a 18 dollar minimum shipping charge. So all together it would have been 4 tubes $32(what they recommended) + $18 shipping = $50 to reseal. Think i might rethink using the black.

bratliff
01-15-2010, 10:58 AM
Well, I ordered this stuff (https://www.thatpetplace.com/pet/prod/211961/product.web). I hope it'll work for what I'm doing. It's supposed to be delivered today, so, I'll get to work with it this weekend. I really wish there were a good local source for this stuff.

I used the GE Silicone 1 when I first built my sump/refugium for my 90g to hold the glass panes in place. It failed after a couple days of being submerged. I thought I'd just bought the wrong stuff.

RyanP
01-15-2010, 11:34 AM
Well, I ordered this stuff (https://www.thatpetplace.com/pet/prod/211961/product.web). I hope it'll work for what I'm doing. It's supposed to be delivered today, so, I'll get to work with it this weekend. I really wish there were a good local source for this stuff.

I used the GE Silicone 1 when I first built my sump/refugium for my 90g to hold the glass panes in place. It failed after a couple days of being submerged. I thought I'd just bought the wrong stuff.

how long did u let it cure?

bratliff
01-15-2010, 1:47 PM
how long did u let it cure?

At least 72 hours, if I remember. Probably longer.

Tony_Caliente
01-15-2010, 10:48 PM
I had a similiar experience with a never used, but previously owned tank. I removed all of the silicone and thoroghly cleaned the seams with acetone, then rinsed then dried and applied a generous bead of aquarium silicone. Waiting almost 10 days before filling the tank. Leaked like a sieve. Went to Wal-mart and brought a whole set-up for $100. For me, it wasn't worth the aggravation. I hope you have a better experience.

RyanP
01-16-2010, 7:43 AM
I had a similiar experience with a never used, but previously owned tank. I removed all of the silicone and thoroghly cleaned the seams with acetone, then rinsed then dried and applied a generous bead of aquarium silicone. Waiting almost 10 days before filling the tank. Leaked like a sieve. Went to Wal-mart and brought a whole set-up for $100. For me, it wasn't worth the aggravation. I hope you have a better experience.

words of encouragement

Tony_Caliente
01-16-2010, 7:57 AM
"FDA/Food Safe" doesn't always mean aquarium safe (esp. saltwater-safe). It may be....but not all are. I would call aquarium manufacturers and see what they use. I bet you can find the black silicone.

Tony_Caliente
01-16-2010, 8:06 AM
Petco has it in black...perhaps if you call AGA that will sell it to you in large tubes designed for caulking guns. I purchased silicone tube directy from Perfecto many years ago.
http://www.petco.com/product/104409/Aqueon-Aquarium-Black-Silicone-Aquarium-Sealant.aspx?cm_mmc=CSEMGoogleProdAd-_-Fish-_-Aqueon-_-1001019&mr:trackingCode=6FA90A1B-54EB-DE11-974B-0019B9C043EB&mr:referralID=NA&GANTrackingID=petco_38766640

RyanP
01-16-2010, 9:53 AM
"FDA/Food Safe" doesn't always mean aquarium safe (esp. saltwater-safe). It may be....but not all are. I would call aquarium manufacturers and see what they use. I bet you can find the black silicone.

Yeah that stuff is a no go. I found it at glasscages.com for like 8 bucks a tube, but they have 18 dollar minimum so it was gonna be like 50 bucks for just silicone. I paid 50 bucks for the tank, lol. Probably just gonna get GE 1 in clear from wally world for 4 bucks a tube

caricell
02-06-2010, 1:56 PM
What I've heard about the GR Silicone I is that since they started selling the stuff to All-Glass, all-glass is repackaging it and selling it (at a higher cost, of course).

In the contract with All-Glass, GE agreed to start putting on their tubes "not for use below the water line or in aquariums."

Notice, they don't say NOT SAFE for aquariums..just not for use.

That's because they have agreed with All-Glass to let the hobbyists buy it from All-Glass and pay more.

I know a number of folks who have used this on their tanks recently with no issue.

I just resealed mine today with it.

cnbridge
02-08-2010, 10:38 AM
I am using Momentive RTV sealant. I bought it at grainger for about $9 a tube. It was recommended on several reef sites.

http://www.grainger.com/Grainger/items/4UH10?Pid=search

Rbredding
02-08-2010, 2:14 PM
Here it is for $14.95 / tube... I used 2 tubes when I did my 90 gallon aquarium with 2 overflows.

14.95+41.95+7.95 = 37.85 and no worries about it... (http://cgi.ebay.com/10-3oz-All-Glass-Aquarium-100-BLACK-Silicone_W0QQitemZ290359243586QQcmdZViewItemQQptZL H_DefaultDomain_0?hash=item439ac27342)

(I assumed they would combine shipping, they may not.. then again, as I said before, Call Marine Design in Johns Creek or Creation Reef in Woodstock - I've SEEN the exact same product in their stores so I know they can get you however many tubes you need..

cr500_af
02-08-2010, 2:44 PM
I had a similiar experience with a never used, but previously owned tank. I removed all of the silicone and thoroghly cleaned the seams with acetone, then rinsed then dried and applied a generous bead of aquarium silicone. Waiting almost 10 days before filling the tank. Leaked like a sieve. Went to Wal-mart and brought a whole set-up for $100. For me, it wasn't worth the aggravation. I hope you have a better experience.

Makes me thrilled to hear... I'm about to take apart a 240g to reseal/rebuild it. LOOOONG water test to follow. With plenty of sand. I want more weight than it will have in use.

LilRobb
02-08-2010, 3:41 PM
Oh c'mon Barry...
I did this before - it's about how clean you can work...

cr500_af
02-08-2010, 3:42 PM
Oh c'mon Barry...
I did this before - it's about how clean you can work...

LOL... you've seen how clean I work! I plan to build the stand this week and get started (using the stand as an assembly table).

whiteheadfamily2415
02-13-2010, 1:53 PM
Don't know if anyone has used this before, but I just ordered a couple tubes for a DIY project I have going. It's not $4 a tube, but it is fairly cheap and made for auarium use....

http://www.petsmart.com/product/index.jsp?productId=2754549