I use it as part of my daily makeup routine in the morning. The order goes like: skincare → sunscreen → primer → liquid foundation → Make Retouch Base → face powder. You can apply it lightly on the wings of nose and blend it softly with fingers. Apply it lightly and you can create a matte finish without smudging the foundation. It's not like it completely prevents oily shine, but the way it shines is different. If you press tissues on your face lightly, it will return to a matte finish as the foundation being fine without smudges.
Primer & Concealer
This makeup base that smooths the oily shine is usable even over makeup. The clear white formula turns transparent as spread on the skin. The powder comes with a high sebum absorption property, which instantly absorbs oily shine for a silky smooth, matte finish. It doesn't leave any leave any white cast or tighten the skin. In addition, the powder particles come in3 different sizes, covering pores to result in a smooth skin texture as if set with a face powder.