K9 Lanrui Thixotropic Desoldering Paste For Fingerprint Flying Line/Battery Holder/Tail Plug Welding. Repairing mobile phone components like battery holders and tail plugs. Removing flying wire jumpers. Repairing mobile phone chip pins, tail plugs, and motherboard screws. Solder paste removal. Assisting in desoldering in various repair scenarios. Wire base welding. Oxidation point repair. Fine-wire patch welding. Main board pad cleaning.