No. I don’t have any of that. I could get some though. Is keg lube robust enough for a kettle repair bodge? It’s quite a steady trickle when filled above the thermometer fitting with water. I looked at food safe sealants but I’m unsure if they are the best solution.
If it's as bad as that then a new washer will be required. I actually use a food-safe silicone spray for my kegs and it does a great job. The other bodge I'd maybe try, is a load of PTFE tape around the washer.
Check the kitchen cupboard for a silicone baking tray or similar and cut a gasket from making sure it's a tight fit but not twisted. I've done this on a few occasions and no issues though haven't had a thermo well.