Siliconing baffles on a sump
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Old 12-31-2014, 02:01 AM   #1
FwoGiZ
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Siliconing baffles on a sump


So I miscalculated the tank I am going to use for a sump... I thought the outside was 12in but happens that the inside is...
I have had 5 pieces of glass cut at 11 5/8in... so there is literally 1/4in missing on each side. Those baffles aren't gonna hold much pressure as it is but I am worried that they might not hold good as they aren't tight enough if I proceed with siliconing them as it is...
Anyone know if they'll hold or should I scrap that 40$ of glass and get new one?

thanks in advance
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Old 12-31-2014, 02:07 AM   #2
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You're gunna use a ton of silicone, and it's going to be a pain in the ass.
In addition every time you see it it's going to tick you off.
Do I think it will hold? Yea, most likely will.
Do I think you should get new glass? Yea, it would drive me nuts if I didn't, I know that much.
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Old 12-31-2014, 02:45 AM   #3
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If the sump is glass and the baffles are glass then the silicone ought to do a decent job. Yes, it is a bit of a span, but do-able.
If you are trying to get it to stick to plastic, acrylic or similar, then don't. The silicone won't stick well enough to do the job.
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Old 12-31-2014, 02:57 AM   #4
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Yeah I thought about the fact some people apparently use acrylic on glass which I would never do but I can see it working for a sump...
Anyhow, I have glass and am used to siliconing stuff so I think I can do it.
I don't really care about esthetics this is a old dirty tank that I am using anyways... it will be well hidden under the stand.
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Old 12-31-2014, 03:02 AM   #5
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In that case, glass to glass, silicone will work just fine.
Clean all the glass really well, and wipe it down with either rubbing alcohol or acetone.
Have some clamps or painters tape or other things available to hold the glass in place while you are caulking. It will take at least overnight to be strong enough to trust holding up the glass partitions.
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Old 12-31-2014, 05:28 AM   #6
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Why not get two additional pieces of 1/8" glass and silicone those to the inside of the tank to take up the space and then glue your dividers to those as was your original plan.
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Old 12-31-2014, 10:10 AM   #7
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Quote:
Originally Posted by FwoGiZ View Post
So I miscalculated the tank I am going to use for a sump... I thought the outside was 12in but happens that the inside is...
I have had 5 pieces of glass cut at 11 5/8in... so there is literally 1/4in missing on each side. Those baffles aren't gonna hold much pressure as it is but I am worried that they might not hold good as they aren't tight enough if I proceed with siliconing them as it is...
Anyone know if they'll hold or should I scrap that 40$ of glass and get new one?

thanks in advance
I did the same thing on a sump build for a salt water tank. It will hold, you'll just need extra silicone. Not a big deal. Use a good silicone, not all silicone is created equally.
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Old 12-31-2014, 01:00 PM   #8
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Originally Posted by neonmkr View Post
Why not get two additional pieces of 1/8" glass and silicone those to the inside of the tank to take up the space and then glue your dividers to those as was your original plan.
Great minds think alike! You can probably get away with one strip of 1/8" siliconed in place to take up some of the slack. The shop you had them cut at may even be nice enough to cut it out of 3/16".

Acrylic baffles will fail. I've lived that nightmare.
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Old 12-31-2014, 01:12 PM   #9
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Originally Posted by FwoGiZ View Post
Yeah I thought about the fact some people apparently use acrylic on glass which I would never do
why not? I used acrylic for my sump. the biggest problem is ensuring the acrylic is thick enough to handle the water pressure. 1/8" isn't going to cut it. not sure if 1/4" would in mine, it's a 40b, so I used 1/2" acrylic with maybe 1/8" distance from the glass on either side. worked just fine until the old used 40b sprung a leak.
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Old 12-31-2014, 04:00 PM   #10
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why not? I used acrylic for my sump. the biggest problem is ensuring the acrylic is thick enough to handle the water pressure. 1/8" isn't going to cut it. not sure if 1/4" would in mine, it's a 40b, so I used 1/2" acrylic with maybe 1/8" distance from the glass on either side. worked just fine until the old used 40b sprung a leak.
silicone does not stick properly to acrylic... you can glue acrylic to acrylic with the proper glue but you simply cannot glue acrylic to glass.

I didn't know cutting a 1/8in piece of glass was even possible...!! I might give that a try.. I'll see what they'd charge me to do so but won't those thin slices of glass be very fragile? Should I use just one 3/16in slice on one side instead?
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Old 12-31-2014, 04:19 PM   #11
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Yes, use the thicker glass, and just do one side. Make sure there is still a bit of a gap so the silicone will have a place to go.
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Old 12-31-2014, 05:20 PM   #12
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Originally Posted by FwoGiZ View Post
silicone does not stick properly to acrylic... you can glue acrylic to acrylic with the proper glue but you simply cannot glue acrylic to glass.

I didn't know cutting a 1/8in piece of glass was even possible...!! I might give that a try.. I'll see what they'd charge me to do so but won't those thin slices of glass be very fragile? Should I use just one 3/16in slice on one side instead?
To clarify, 3/16 refers to the thickness of the glass. You would need a strip that's 1" wide and silicone it in place between the baffle and the sump wall to take up most of your 1/4" gap. That would leave enough room for expansion.
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Old 12-31-2014, 10:08 PM   #13
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silicone does not stick properly to acrylic... you can glue acrylic to acrylic with the proper glue but you simply cannot glue acrylic to glass.
it still works well enough in a sump. the biggest issue you'll face using acrylic is flex. with glass being more rigid, you can get away with something much thinner. I used 1/2" thick acrylic for my baffles, but they were being placed in a 40b. If I put down a piece at the base of the baffle I probably would've been fine with 1/4"
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Old 01-01-2015, 04:30 AM   #14
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The extra gaps shouldn't be much of a problem as mentioned. Remember that when used as baffles in a sump there really isn't much pressure. There will be equal pressure on both sides of the glass so nothing is really pushing against it. Don't under estimate the strength of fully cured silicone to glass.
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Old 01-01-2015, 01:49 PM   #15
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The extra gaps shouldn't be much of a problem as mentioned. Remember that when used as baffles in a sump there really isn't much pressure. There will be equal pressure on both sides of the glass so nothing is really pushing against it. Don't under estimate the strength of fully cured silicone to glass.
except when you're filling up. also keep in mind that there is more pressure in one direction due to the flow of water.
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