ok, here is the deal. you are using a product that claims to be 100% RTV silicone and a acetoxy curing agent. that agent is used in automotive, aviation, and marine fields commonly, and also is the active ingredient in normal "Aquarium-Safe Silicone" of all forms.
thats the good news.
the bad news is that, its either a trade secret, or i just cant find it, but after 20 minutes of scouring the web, I cannot find a list of the inert ingredients of the adhesive you are using. and that could be bad. because in automotive and household silicones they put all kinds of goodies in there that can leach out and kill your fish.
so,use at your own risk. personally, i would have made a stop at my local hardware store and purchased a tube of 100% RTV stuff or GE type 1 silicone. those types of silicone even though sold for house use say on the label they work for aquarium patches. a few bucks for piece of mind...worth it in my opionon.
if you want to keep using that stuff, build it, put it in a tank with no occupants and drop a feeder fish in the water and see if it lives for a few weeks to play it safe.