I used to use the LETS (long gone) white graphite for mold release. It was awesome and protected against rust.
When it was no longer available, I tried conventional graphite for locks in a spray can from McFadden-Dale.
This stuff has no residual carrier - it is FOR LOCKS? The carrier evaporates, leaving a nice coat of graphite on your molds.
It is a wonderful release agent. It MIGHT also protect against rust.
Good stuff.
Make sure IT HAS NO RESIDUAL CARRIER? If it for locks, it should not have that.