Originally Posted by
Old Fat Guy
The problem is the aluminum alloy reacting to steel. PB Blaster is no good for this.
IIRC, a Peugeot UO-9 has a steel seatpost. PB Blaster is the best for stell on steel issues. Before I discovered BPB Blaster, I used a home formula based on 50% Iodine and 50% Mineral oil. It took a few days but worked rather well.