Patching a broken valve - GIF

[Frank S]

Looks suspiciously like JB Weld, although I think someone is being a bit disingenuous with the drill and hammer.

Yes it does look like JB weld but many 2 part epoxies look the same. One thing I noticed was his lack of proper surface preparation. You never want to rely on the bond between paint and metal or epoxy on paint to achieve ultimate bond strength,