Forget 'plaster' as just slapping mud on a wall — 塈 (jì) is the ancient, precise verb for *applying fine clay or lime-based coating to smooth and seal surfaces*, especially in elite architecture. It’s not DIY home renovation; it’s ritual craftsmanship. You’ll almost never hear it in modern spoken Mandarin — it’s a literary, technical relic, surviving mostly in classical texts, historical restoration documents, or poetic descriptions of ancient buildings. Its feel is tactile, deliberate, and slightly ceremonial: think of artisans kneeling before palace walls during the Zhou dynasty, smoothing layers with bamboo trowels.

Grammatically, 塈 functions as a transitive verb — always followed by what’s being plastered (e.g., 塈墙 jì qiáng — 'to plaster the wall') — but crucially, it *never* takes aspect particles like 了 or 过 in contemporary usage. Learners mistakenly say '塈了' — but native speakers would instantly flag that as archaic or ungrammatical outside quotation. Instead, you’ll see it in passive constructions like '此墙已塈' ('this wall has been plastered'), where 已 signals completion, not 塈 itself.

Culturally, 塈 carries quiet prestige: it implies refinement, durability, and aesthetic control — unlike generic 涂 (tú, 'to paint/smear') or 抹 (mǒ, 'to wipe/spread'). A common mistake is overgeneralizing it to mean 'paint' or 'cover'; 塈 specifically denotes *fine, cohesive, binding earth-based application*. It’s also easily misread as 單 (dān, 'single') due to visual similarity — but that confusion would turn a sentence about wall restoration into a baffling declaration about singularity!