Rounded Nut Removal (Hack!) I can’t believe this worked!

While working on my 2008 Toyota sienna, 2GRFE, the 10 mm nut that holds the thermostat housing got rounded off. I panicked and did not have an extractor set so I wasn’t sure what I would do, it’s in a very difficult location reachable only by an extension.
Then I remembered I had some water weld in the basement. I took some small amounts of the world and placed it in the crevices of the socket, then I pushed it on the rounded nut and waited for about 10 minutes. I was able to get it to come off, I had to use a breaker bar to make it happen but the weld offered enough friction so that it was able to come off.
Maybe you can use this! Maybe you cant, just letting you know.