A foundation primer is as important as the rest of the makeup.
Using a foundation primer helps keep the foundation itself in place. It is used after applying a moisturizer and just before applying the foundation.
A flawless face is always desirable and while a great skin works to make that possible, getting the foundation application perfect equally goes a long way.
A primer preps the skin for the perfect foundation application usually by filling in fine lines and smoothing pores keeping the skin fresh and flawless so every other product that goes on is done flawless.
A lot ladies don't necessarily know how to work up a primer. Note that applying the primer with fingertips or a sponge is best and once the primer is applied, allow a few minutes for it to set before applying your foundation.
Watch this guide above on how to nail it like an expert.