. My friend has given me a shotgun with a damascus barrel. In one area something had spilt on it causing a dark discoloration. I tried to remove it but could not. I polished the barrel with a purple scotch pad and oil. I got some Laurel Mountain barrel brown. I started last night and following the directions continue today. I live in VT and is very dry in the winter so have rigged up a humidifier in the bathroom to help but it is going slow which is ok by me. The question I have is does anyone know what once I have finished browning what should I do to make this the best.