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.
http://ts2.mm.bing.net/images/thumbnail.aspx?q=4998595217130769&id=774b3f1381e01a107a90cd0438114cea (http://www.maast.org/images/view;_ylt=A2KJke2DZuxPf2EASGGJzbkF;_ylu=X3oDMTBlMT Q4cGxyBHNlYwNzcgRzbGsDaW1n?back=http%3A%2F%2Fimage s.search.yahoo.com%2Fsearch%2Fimages%3Fp%3Daquaroi um%2Bsealant%26fr%3Dyie7c%26tab%3Dorganic%26ri%3D8&w=400&h=400&imgurl=www.petworldshop.com%2Fpictures%2Fsilicone-aquarium-sealant.jpg&rurl=http%3A%2F%2Falmutbranner.ifunnyblog.com%2Fac rylicaquariumsealant%2F&size=31.7+KB&name=Acrylic+Aquarium+Sealant+by+Almut&p=aquaroium+sealant&oid=57e0733c318913fabb97fa434b96edb3&fr2=&fr=yie7c&rw=aquarium+sealant&tt=Acrylic%2BAquarium%2BSealant%2Bby%2BAlmut&b=0&ni=21&no=8&ts=&tab=organic&sigr=11qfs5ddj&sigb=12qnule1s&sigi=11r898ri7&.crumb=.CI.cviBG0x)

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"
http://t0.gstatic.com/images?q=tbn:ANd9GcQVJYzy4m2MEYEQbbJH0GE4CsilLzjGX 5a2vgmrL8uwm8RTUXleidTuRolu

[ErikH]

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

[Noob]

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

Yup, its I*