I'll just add that when it comes to strenght, all 100% silicone is not equal. If you are talking about just using it for a background or driftwood, use anything that is 100% silicone. If you are using it to reseal an aquarium, esp. any larger than 10g, you may want to use the higher-strength stuff that is mentioned in the stickied thread at the top of this forum.
And the number one problem with silicone is that if it is too old, it will not cure. If it comes out of the tube gloopy, beware.
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