Lining an Old Rivet Coal Forge

A quick video of adding a refractory liner to an old rivet forge. I mixed up 50% Plaster of Paris and 50% finely ground kitty litter. Some say it will work some say it won't only time will tell. The coffee grinder had a thermal fuse that burned out and had to be removed and wired to bypass it. I ground five to ten batches then would stick it in the freezer to cool down.