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I am going to be resiliconing a tank and I am wondering if this is safe for fish?
That will be ok for any small tank after days of drying. One day per millimetre . A 1/4 inch / 6 mm join needs a week to dry completely.
That silicon is not structural grade and is not suitable for 30 gallon tanks or bigger.
Here is what aquarium advisor says:
This all-purpose sealant from Dap is 100% silicone and used to both build and repair aquariums. Once applied, it takes 24 hours to cure completely. Then, it's non-toxic and safe for use in any aquarium, freshwater or saltwater. It's completely waterproof, stays flexible, and won't crack, peel, or shrink over time.