noun
surface preparation; scraping clean
Technical term in painting and construction: removing old paint, rust, or dirt from a surface before applying new coating. Often used in DIY and professional contexts.
塗装の前にケレン作業をしっかり行うことが大切です。
It is important to do thorough surface preparation before painting.
古いペンキをケレンしてから新しい色を塗ります。
I scrape off the old paint and then apply a new color.