I am polishing some SS plate (8" x 11" x 3/8"thick) and then stamping words into it using a set of letter punches. I want to fill the letters with some fairly bright silver colored solder and then polish the entire face to a mirror finish.

I need recommendations for a non-tarnishing soldier that will flow into these letter impressions (which are 4 mm tall) and stay put. I had thought of using epoxy with some kind of finely ground tin dust but I would rather do it with metal if possible.

Thanks in advance for your input.