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I just contacted GE's silicone department and asked them the infamous "Is GE Silicone I safe for aquarium use" question. Their official response:
"As far as the product being safe, yes it is. It will not leach any toxins into the water. But, it will not hold up submerged underwater continuous."
The question and response was asked on July 27, 2011.
As for the MSDS on the product; if my memory serves me correct...all the "bad stuff" is when the silicone is wet. A lot of the additives are used to help cure it to a rubber state. I know I use a lot of sealants/epoxies/resins at work, and they are all horrible for your health uncured. Once they are cured, they are safe.
A good example of this is PVC glue. It contains Methyl-Ethyl-Ketone (MEK) which is known to destroy kidney's and liver...and yet once it has fully cured..it is OK for use in potable water systems.
Hope this could be of help.
"I am a nice shark, not a mindless eating machine. If I am to change this image, I must first change myself. Fish are friends, not food"