Poreless putty primer is a product designed to smooth out skin texture, fill in fine lines, and create an even base for makeup. It can be applied all over the face or targeted to specific areas where you want to minimize the appearance of pores. To use poreless putty primer, you'll want to apply a thin layer all over your face, making sure to blend it in well. It's best to apply it after you've moisturized and before you've applied any other makeup.