to spread or rub a substance such as cream or paint on a surface

涂，敷

敷面膜就是apply a facial mask，需要注意的是mask也有口罩的意思。

Apply the cream liberally to exposed areas every three hours and after swimming.

每3小时及游泳后将防晒霜充分涂抹于身体裸露部位。

The paint should be applied thinly and evenly.

漆应该薄薄地刷上一层，且要刷得均匀。