遮蓋液用於保留不想上色的區域，特別是使用在噴槍技術上，還有水彩跟蛋彩。
遮蓋液主要功能在畫家不想上色的區域形成一層保護膜。
乾燥後可以用橡皮擦或乾布擦拭掉，露出原本遮蓋未上色的區域。

Liquid Mask is used to reserve areas which are to remain unpainted, especially in airbrush techniques, but also with watercolors and temperas.

The product forms a protective film on the area which the artists does not want to paint.

Once the work is dry, liquid mask is rubbed off with an eraser or piece of cloth, revealing the unpainted area.