Re: Prepping to re-bed stanchions.
good advise above but use an epoxy that can bond to posible damp surfaces and is reinforced with fiber/kelvar etc. for strength. Google/Bing Wet Dry 700 epoxy
note that you can insert greased screws/bolts into wet epoxy. When the epoxy cures you can un-screw the bolts and have a threaded/tapped hole.