• Holding mechanical parts together during assembly, for example some parts in automatic transmissions. It dissolves in the transmission fluid and doesn’t impair it’s performance or clog anything like greases could.
• Packing a replacement oil-pump with it to effectively pre-prime it so it pumps oil as soon as you start the engine it’s attached to.

I reckon posts linking to your self-hosted videos would work if they had an embedded video – if your instance set the <meta property="og:video ..."\> tags appropriately.

Also possible to make posts on your own instance which automatically federate to lemmy communities, as in this example which originates from a mastodon instance: https://lemmy.ml/post/41288461

https://joinpeertube.org/instances

Peertube is federated and self-hostable.

Even better, posts linking to peertube videos get an embedded video in the post: