I think either one would work fine in most applications.  The point is:  just bare metal?, or bare metal with some kind of protection barrier against incoming humid air.  Consider a simple 1/4" Male blade connector, with a matching 1/4" Female connector.  With some sort of greasy coating, the two connect together, metal against metal.  But what is happening is that a very tiny fillet of greasy coating forms along both sides of the sharp metal to metal connection as the two are shoved together, and this is what helps prevent corrosion.  A barrier.  This is my theory anyway.  Without this coating, you have a very nice crevice for water molecules to lodge and start to go to work.

    On Wednesday, June 14, 2023 at 05:22:38 PM PDT, Jim Felder <jim.felder@gmail.com> wrote:  
 
 Vaseline does t last very long, dielectric grease does.

Jim

Sent from my iPhone

> On Jun 14, 2023, at 5:27 PM, David McNeely <davmcneely40@gmail.com> wrote:
> 
> vaseline?
> 
> On Wed, Jun 14, 2023 at 12:41 PM Richard Koerner <rjkinpb@sbcglobal.net>
> wrote: