Like said above, it's main purpose is for bringing soft punky woods to a more harden state that you can work with, but also its important for burls. Burls have a tendency to check and Crack anywhere. By infusing it with resin during the process, it bonds all the wood fibers together, to keep it from checking and cracking. I like to use it because in my opinion, stabilizing the wood, makes the call much more consistent in the woods when exposed to different temperatures and humidity, producing a call more consistent in sound over the broad spectrum.