bought my Pro-Melt used and it has never dripped. Had the thermostat go out and wired the pot to max temp. Then put PID on it and it will hold with 1° give or take through entire casting session.
I did learn that when the lead level drops below the end of the thermocouple the meter will drop but the juice keeps raising the pot temp trying to get back to set temp.
I've torn my apart at least twice--just drill out the 8 pop rivets and replace when reassembling. Got the aftermarket shelf and lid that is sold on this site and it pretti-near casts by itself.