The reason your gun broke in so quickly is the lack of lube allowed the parts to rub together and wear in. The liquid lube will help transport the small particles that wear off away but lubing it first will keep the parts from wearing in quickly and extend the break in time. Lubricants are designed to slow wear with a film that separates the parts like engine bearings. Gunsmith polishing is speeding up the wear in process. Pretty simple. Shoot then lube to remove particle to prevent galling.