You won't find foundation primer in the grocery store bargain bin, so consider your pursuit of this product worth the splurge.
Foundation primer, a clear gel-like liquid, is one of the beauty industry's best-kept secrets. It has the power to fill fine lines and smooth acne scars; even if you have an unmarred complexion, primer is a must. It can be used to marry foundation to your face like a second skin -- and the commitment will last all day, too.
Apply foundation primer after moisturizer and before foundation to give your skin a velvety appearance. You can also mix a high-end primer to a cream foundation for sheer, natural look [source: Yi].
And don't forget eye primer. This specialty cream is applied pre-foundation, but only to the eyelid area, and will keep eye shadows in place and prevent creases from forming.