. �I wish to tin them and can
either cart them off to an electroplater or tin with solder. �

Several have addressed the type of plating.

My suggestion involves the heating. If Mama will allow preheat them in
the oven. Perhaps this will be hot enough for all the heating they
need. If not get a hotplate for the final heating before simply wiping/
tinning the bars with the solder of your choice.

Not sure what the number of the bars is but a larger solder pot would
allow the tinning to be done by immersion.

As another said watch out for the fumes.

Bob AZ