It's always tough chiming in for questions when friends are involved. So is this a 30 Gallon Pot? That's no small job if the person wants to use it or make it look new (what's the difference). That at minimum 100 if not 150. Friends or not you're doing the work. If you both are in the habit of doing favors then it comes down to what you think is fair amd nothing to do with others opinions.