unibob link said:
[quote author=MrHermit85 link=topic=5746.msg55590#msg55590 date=1373544421]
[quote author=pulpfiction1 link=topic=5746.msg55212#msg55212 date=1373070805]
This is the stuff I use that yellowed on me in my sump,so i correct myself on the GE stuff
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Yup that's the same as what I used. Also just happening in my sump.
reeffreak link said:
The GE silicone that's the correct one does not discolour . I believe it's windows and doors 2 ... I wouldn't be surprised if the silicone you used is leeching. 5 bucks for a tube at Canadian Tire
There are people that have had some funny stuff happening with GE windows and doors II as well, except the yellowing is slightly different and in some cases it flakes... It seems that the homehardware stuff always yellows though. I would love to re-do the silicone but it will cost more than $5 as I will have to tear down everything and start from scratch (Water, salt and time) and it is only in my sump which is fine I guess ??? What should I test for if you say it is leaching? The others say they didn't have any problems with theirs leaching but I wouldn't mind checking before going any further...
Boga link said:
In the yellowish/greenish areas, is the sealant still attached to the glass. Try to lift it with the finger. Maybe algae started to grow between the glass and silicone? I see zones where the silicone is still clear.
What is the exact part number/grade of the sealant?
Does it have an expire date? Did you open the tube recently or is like 6 months old?
How long did you wait to cure before you had to use the sump?
I attached two photos with all the bin numbers and dates on for you. It was definitely not expired and the sump was left empty for over a month after installing the baffles. I also tried to wiggle the baffles free but they are still attached quite firmly (as per before I filled it with water).
Poseidon link said:
[quote author=pulpfiction1 link=topic=5746.msg55118#msg55118 date=1373004384]
i just figured it was a reaction to the type of lighting i was running in the sump,i had no effect what so ever,was looking in older threads to find some,maybe tomorrow,i have used it in the past and never seen it yellow,just in my sump tank that once,i never considered it a problem
I used the home hardware stuff on my sump as well, it is also discoloring, no negative effects to speak off on my frag tank but just an unsightly yellow silicone lol
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It is quite ugly lol does give my sump a more natural look though lol
Thanks for comments!

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I used exact same stuff from Home Depot, in my sump. Mine didn't turn yellow.
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Well I dont know what could cause it then.