Reported practice · r/Urushi

First-year urushi lessons: base-coat smoothness, raden cure time, and a chopsticks ground sequence

A practitioner reflecting on a full year of urushi work reports the recurring mistakes that cost them time and material, and the corrections they eventually worked out. The thread is a milestone showcase rather than a Q&A, but it surfaces several concrete failure modes and one partial ground procedure.

This page is written from one discussion thread. It records what practitioners reported and what they linked it to — not documented workshop practice. Every claim below links to the comment it rests on, so you can read it in context.

Safety

Ki-urushi (raw lacquer) is a potent skin sensitiser; contact can trigger a delayed urushiol-type reaction that may appear hours or a day after exposure. The thread involves repeated direct handling of ki-urushi, jinoko-and-lacquer pastes, and tonoko putty, all of which carry this risk. Gloves and prompt washing of any splashed material are essential, and a reaction that appears mild on first contact can escalate with repeated exposure.

What the thread establishes

The answer.

The thread establishes that roughness in early coats does not get smoothed out by subsequent layers; the base must be brought to an acceptable finish before adding more. Overpainting a single object (a matcha whisk) produces wrinkles, so brush load must be controlled. A raden inlay transferred onto a bowl tore during polishing because it had not cured long enough; the practitioner settled on a minimum of two days' cure and a gentler hand. For a tray ground, wet sanding stripped the layer entirely, and the practitioner switched to dry sanding at 100 grit. A workable chopsticks sequence is described: ki-urushi coat, jinoko dust, cure, polish, tonoko dust, cure, polish, ki-urushi seal, then black-lacquer coats.

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What goes wrongSeveral distinct failure modes are reported. Wrinkles appeared on a matcha whisk from repeatedly overpainting. Roughness in early coats persisted through later coats on spoons and trays, contradicting the assumption that the next layer would level things out. A raden butterfly wing tore out of the bowl during polishing because the inlay had not been given sufficient cure time. On a tray, wet sanding removed the ground layer entirely.

What recovers itFor the raden tear, the practitioner notes that curing for at least two days and polishing more gently would have prevented the loss. For the rough coats, the stated correction is to focus on making each base layer smooth before proceeding. For the stripped tray ground, the practitioner switched from wet sanding to dry sanding at 100 grit. No full rework of the tray is described; the practitioner added sabi over the top as a shortcut in place of the planned kiriko layer.

Ground chopsticks with jinoko and tonoko

Coat wooden chopsticks with ki-urushi. While still tacky, dust the surface with jinoko powder. Allow to cure, then polish flat. Repeat the dust-and-polish cycle using tonoko powder in place of jinoko. Once the surface is smooth, seal with a coat of ki-urushi and proceed to coats of kuro-urushi.

the comment this came from ↗

··Reported

What was reported

Roughness in an early lacquer coat is not corrected by simply applying more coats on top; the base layer itself must be brought to an acceptable smoothness before subsequent coats are added. ↗↗
Repeatedly overpainting a single object (a matcha whisk) produces wrinkles in the film; controlling the amount of lacquer per pass is the fix. ↗
A raden inlay transferred onto a lacquered bowl should be allowed to cure for at least two days before any polishing is attempted, and the polishing should be done gently to avoid tearing the shell out. ↗
Wet sanding a shitaji ground layer can remove it entirely; dry sanding at 100 grit was used as a workable alternative on a tray. ↗
Sabi putty can be applied over a ground as a shortcut in place of a planned kiriko layer, though the practitioner notes this was an experiment rather than a settled technique. ↗
A teak bowl was prepared by brushing sabi into the wood pores, sealing with ki-urushi, then applying two coats each of kuro-urushi and shu-urushi. ↗

Limits of this source

What the thread does not answer.

The tray ground recipe references 'joshinko paste' and 'seshime ki' without definition; the exact composition and role of each component is not clarified in the thread.
The planned 'kiriko' layer that was substituted with sabi is not explained; its intended function in the shitaji sequence remains unclear.
The chopsticks procedure gives no specific cure durations, humidity conditions, or polishing abrasives beyond the general 'cure, polish, repeat' instruction.

Read the documented methods →