Have you allowed to build up on your rig before climbing up and clearing it off? Got real worried with 18+ inches of Sierra cement and finally did it. Wasn't easy but what a relief!
This is one of the reasons I pony up and pay for indoor storage for the fiver and boat for the winter. That plus the freeze/thaw cycles and the massive amount of rain we get here on the wet coast. I love how they come out in the spring looking exactly as they went in the fall! :B