I was reading Leonard Zinn’s tech column at velonews.com today where several riders were asking how to get a frozen seatpost out of their frame. It seems the carbon seatpost had a galvanic reaction with the aluminum frame or lug and started to melt together. The chemistry causes these two materials to bond to each other when moisture is presented. Leonard gives several ideas on how to fix this problem but the best fix is prevention. So, if you have a carbon seatpost (or frame) and an aluminum frame (or seatpost) you should remove the seatpost whenever you have an encounter with water. To be safe it would be wise to remove the seatpost each month and apply a light coat of grease to the seatpost and re-install it.  Happy riding.