I have found that if You rough up the edges of acrylic where the silicone will be with sand paper, it sticks very well. Iv'e done this many times.
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I wanted to get an opinion that isn't from 2012 and earlier
Any comments on this little tid bit ?
Well, the silicone hasn't changed since 2012, so the answer shouldn't either!
Most acteoxy cure silicones such as GE Silicone I have some sort of aquarium disclaimer on them. Silicone I has been used for years without issues. That said, I totally agree that the momentive RTV sealants are superior.
Acetoxy cure silicones release acetic acid as part of their curing process. Neutral cure silicones such as GE Silicone II release ammonia and/or alcohols which are obviously more toxic to reef inhabitants. You can use neutral cure silicones, the key is to let it cure completely. The curing times listed are for a ⅛" bead, significantly smaller than the layers we typically put down. As a result, the cure times are much longer. Most people recommend waiting 1-2 weeks for full cure before using a tank.
re mildewcides, I have yet to see any definitive proof that 'kitchen and bath' silicones actually include mildewcides as opposed to referring the the natural mildew resistance of silicones. Every tube and MSDS I've read simply says 'mildew resistant'
Have you used this type in your sump?I have successfully used GE Silicone I for a number of projects,
and more recently, for plastic (acrylic) to glass applications, a special GE Silicone for plastics (found in HD in the Acrylic sheet department)
The critical thing with any Silicone is to let it cure completely (2 - 3 days) before exposing to water. Curing Silicone give off ammonia.
Have you used this type in your sump?
Any comments on this little tid bit ?
Yes, in my sump and tank....and a number of other sumps I've built. Regardless of the silicone used, allow it to cure.....minimum for me would be three days, but preferred is a week....or longer.
And, I'm making another sump in a couple weeks and will be using this stuff.