Oil test, followup

Back in December I tried using a new cleaner, Metcor 57 Bore Cleaner, and followed that up with Bore Shield, which is supposed to protect rust.  To try that out I took an old knife blade, sanded it a bit to brighten it up, gave it a light coat of the Shield and left it out under the carport.

Brought it in this morning after more than two months outside.

There's not a speck of rust on the treated surfaces.  So I'd have to say this actually works for the purpose.