I'm trying to remember the temp that my crock pot is set on but it's no where like melting solder. 300-325 degrees? If you burn this plastic/wax/oil mixture it stinks and is no longer any good. I've turned my pot up to "hurry" the melting. Big mistake!
I now have the dial marked as to the exact setting in case it gets bumped. Be patient,it will melt.......if I know I'll be grinding tools for later use, I turn it on when I go in the door. By the time I need it, it is usually melted and ready to use. YMMV