I just bought Sunsheen Porcelain Media. The Rio Grande catalog says:
"For final finishing (requires a break-in cycle of 4-7 days)"
These media have no corners to knock down (they’re round), so why do
they need breaking in?
The catalog also recommends:
Mix 2mm media with either 3mm or 4mm media--2mm media does not
tumble well by itself."
My tumbler is small so I leftover media. If anybody want to swap
some 2mm for my 3mm, please contact me off list.