Lots say 100% silicone but still say mildew/mold resistant. That's the big thing to watch for, mold/mildew resistant also means that it's got chemicals in it to stop that.
+1 on GE Silicon 1, just did my tank/sump in that and works great. I have an acrylic sump that i used weld-on 4 then silicone. The silicone has not shown any water bubbles yet even, it probably could have sealed the acrylic itself... probably...
Lots of youtube video's on doing silicone jobs if you havn't before. Most say to use painters tape on the seems, i did, works great. If you havn't siliconed before like me use the wide tape... I'm still scraping bits off as i see it since i used the 1" tape and i'm sloppier than 1" apperently.
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