Ahhh, that would make more sense... but I'd still worry about some epoxies.. most of them have some really nasty stuff in them... Super is reef safe because, oddly enough, cyanoacrylate glue was originally developed for emergency battlefield wound-closure, when proper suturing isn't possible for whatever reason... As mentioned before, they bond even more quickly when they come into contact with fluids and any rough surface.
Any superglue should technically be "food-safe", although I still wouldn't want to consume it... might be bad for the tummy. Most epoxies, however, are not, and those that are safe for human water-sources are marked just so... So any epoxy, putty or otherwise should definitely be checked to make certain of the above.
Obviously, if you're using this and your tank is in good condition, you're ok, but you should share with us what brand or type of putty in specific you're using.