What goes wrongThe principal practical failure mode is arriving in Japan without knowing which materials are uniquely available there and which are subject to aviation restrictions. One commenter reports difficulty finding needed items while in the country, and another regrets not purchasing charcoal for polishing before departure. A language barrier at the shop (observed two years prior on a weekday) compounded the difficulty for a non-English-speaking companion. Additionally, whetstones purchased for polishing were found to scratch the glaze on ceramic pieces, a problem the crystal toishi are said to avoid.
What recovers itBuy the hard-to-find or travel-restricted items (brushes, crystal toishi, tokusa, charcoal, urushi for glass) while in Japan and source the remainder (sandpaper, hobby knife, masking tape, filtering paper) back home. If time is short, order from the named shops internationally; shipping to eastern Canada was reported as a week or less. For polishing glazed ceramics, substitute crystal toishi or tokusa for whetstones to avoid scratching the surface.