On Monday, May 25, 2020 at 1:58:29 AM UTC-5, DerbyDad03 wrote:
Asking for a friend...

The image below is part of a steel weather vane. As you can see, it's rusty and
getting worse. My friend wants to remove the rust then clear coat the piece to
prevent the rust from coming back.

You can't really tell from the image, but there appears to already be some type
of (uneven) clear coat on the piece already.

What's the process to remove the rust and existing coating without damaging the
metal and what's the proper product to prevent the rust from coming back?

https://i.imgur.com/bk3eTz5.jpg

Thanks!

Derby, there is a polymer that converts rust to an epoxy like substance. Car restorers and repair shops know about it. I first ran across it in the late 80's. Now, it would be nice if I could tell you the trade name, but the memory files are rather spotty back that far. ;-)