Sealant for DIY sump

[Noob]

What kind of sealant can I use to re-seal a baffle in my sump?
I looking for something other than this stuff (pic below). Its kind of expensive for the amount you get.


Im looking for something i can use in a caulking gun and is reef safe.

[Scutterborn]

I'd say the tubes of 100% silicone at home depot would do it but it won't truly adhere to acrylic. If it not a load bearing baffle it'll work to at least keep it in place. Weld-on is really your best bet though. If you go the silicone route, make sure it doesn't say algae resistant and 100% silicone. You don't want that algaecide stuff in your tank. Ace (Hobogato) may be able to repair it for you at a very reasonable price as well...

[Noob]

I'll stop by HD an check around for it.
Its just a simple DIY 20g sump and the reason the baffle failed is because i didn't realize i had rocks leaning on it

[Scutterborn]

Gotcha. That silicone is on the isle with all the other tubed type sealants. It'll adhere to the glass of the 20 long. It should work fine.

[Big_Pun]

elegant reef carries a high strength silicone I forget the name its about 10 bucks or so a tube(goes in calk gun)

[grouch]

GE SCS1200, but Louis was out. Over 400 lbs per inch tensle strength.

elegant reef carries a high strength silicone I forget the name its about 10 bucks or so a tube(goes in calk gun)

[rrasco]

You can use GE I from HD or Lowes. Preferably, if it's not time sensitive (what isn't?) you can get some Momentive RTV108. Grainger MIGHT have some. FWIW, AutoZone also some Permatex RTV. I have used this before as well. RTV is a silicone with a higher tensile strength.

[klwheat]

As above, just make sure it's 100% silicone...not the silicone II stuff that's mold resistant.

[Noob]

So i bought this stuff from HD for about $5.50.
I called the number on the bottle and they confirmed that it DOESN'T have any "mold inhibitors"

[ErikH]

It should say GE SILICONE I, not II, if it doesn't you're good.