All true Renaissance men make their own sealing wax rather than buying the modern "sealing wax" found in the malls.
The commercial makers of commonly found sealing wax discovered that customers were complaining when the sticks of their product arrived broken. These original versions were rather brittle - so the makers removed components and added resins to prevent breakage in shipping. In addition, many of the current products are basically hardened glue. This is similar to glue sticks. In fact, it is possible to buy current forms of sealing wax in stick form intended for low melt glue guns.
Below is a typical formula for old time red sealing wax:
Orange shellac ... 39 pounds
Rosin ... 78 pounds
Turpentine ... 14 pounds
Whiting ... 56 pounds
Silex ... 35 pounds
Pale vermillion ... 5 1/4 pounds
That should mix up enough for any of you :D
The newer products on the market are not intended for long term durability. They, like most items mass marketed today, are intended for show and that is all. Once you have bought the product, the makers are done with you. If it does not hold up, tough.
Crim, I think you can count on your seal falling apart as it will contain few items to keep it together. Many things that were readily available in a quality form when I was growing up are no longer being made anywhere in the world. I do not see the situation improving - ever. It is not Todd's fault. It is the way the world is becoming - disposable.