Tony, First off, I had, what we here refer to as a "brain-fart". Force-44 is tin/silver,as you say, not tin/cadmium. Cadmium is bad stuff when vaporized, not good for the health, what.

Not positive on origin of term "tinning" as used for applying thin coat of solder to surfaces, prior to final assembly. I have read of the old boys applying pure tin with a rosin flux. Very possble some may still. Seems logical that that's where the term "tinning" arose.