You are reading a single comment by @NotThamesWater and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
NotThamesWater
This would traditionally be done with burnt sand and linseed oil mastic. I wouldn't use silicone because you risk trapping moisture behind the silicone which will lead to rot issues. Lime putty would be good in this situation as it's breathable so any trapped moisture will be able to escape.
That soft spot could be the tip of the iceberg. It needs chopping out and treating / filling with timbabuild or repaircare.