Sugar will toughen the eggs membrane.
I copied this post from a thread in another forum. Not sure if you have used this site.
just FYI, I broke down and got amato's books on
egg cures. There are many to choose from; but the author and his closest friends (who collectively catch a LOT of fish) do agree on one cure that has outfished all others combined. I don't remember the ratios (I will edit and insert when I get back home) but the ingredents are: sodium bromide, pure anise oil (not the stuff from the bakery aisle) and sugar. Its a skein cure, not a single
egg cure. For singles, it seems like a lot less is used, and you must watch them a lot closer than with skein, which is a shake and bake type approach.
For many of the different
cures, they explain "why" each ingredient is important and what its function is. Like, sugars in one form or another harden membranes, while salts of various types are used to extract moisture. Replacing that moisture with liquid scents and liquid dyes allows it to be re-absorbed, and the tough membranes control the milking......
Interesting stuff. Out of the 20 or so
cures, many endorsements are given to commercial, ready made
cures. there are a ton of em out there.
http://steelheadsite.com/forums/viewtopic.php?t=3712&highlight=egg+cures
I've used sugar to cure my skeins but only with equal amounts of salt, sugar and borax. I added knox geletin as well. It was probably my most productive cure.