A powder top coat that adds a matte protective layer to lime-painted walls
See price on Naver
The details below follow Kalklitir's Top Coat in Belgium. Check the Naver SmartStore for the size and price sold in Korea.
Detail
The official product detail page (image text in Korean). A text version follows below.

Text
Top Coat
Yes, after suitable preparation for the piece. A water-based matt top coat is recommended against wear and stains; the colour may deepen slightly after coating.
We recommend at least 2–4 hours. Drying can take longer depending on temperature, humidity and the surface. Avoid contact with water for at least 10 days so the paint can settle.
Yes, after suitable preparation for the piece. A water-based matt top coat is recommended against wear and stains; the colour may deepen slightly after coating.
Customer service +82 70-7543-9529 · Weekdays 9:00–17:00 KST
Shipping terms apply to orders within Korea. For overseas or bulk orders, please contact us.
Guide
Remove dust and grease from the wall.
Mask the floor and the edges of surfaces you are not painting.
Mix product and water at 1:1.7 for about 10 minutes until smooth.
Apply with the Kalkpaint brush in random, irregular strokes.
Once dry, apply a second coat the same way, 2–4 hours later.
Cover leftover mixed paint and stir well before using again.
From mixing to brushwork, see how it is done.