Coating, Painting
noun, verbal noun
With paint I want to attire the wall. Let's put a coating of painting up on the wall.
とそう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
遅くなって、本当にすみません。トイレの壁の塗装が思ったよりも長引いてしまって。
I am so sorry for being late. Painting my bathroom walls took me longer than I thought.