Powder Coating is either a ThermoPlastic or a ThermoSet coating. The electrostatic is only used to make the powder attracted to the piece that is being coated. A ThermoPlastic coating can be converted back by heating. A ThermoSet uses a Chemical reaction and once solid will not convert back. Like I said before a strong chemical stripper should take it off, and then a good cleaning to finalize the process.Powdercoat is put on with an electrostatic charge, so i wonder if you couldnt somehow reverse the charge to aid in removal.