Janet, The Sunsheen Porcelain media we sell at Rio needs a break in
because the media comes from the manufacture slightly porous. Because
of this porosity the media is slightly abrasive when new. Running the
media 4-7 days will “glaze” it over making it extremely smooth and
hard. Also, put some silver scrap and a burnishing compound in with
the media during the break-in cycle this will help the break-in
period. One more note about porcelain burnishing media, the more you
use it the better it performs. I hope this helps and thanks for your
patronage!