Oh yeah, forgot to add, primer has the consistency and texture of a moisturizer. It is clear and you just apply it like a moisturizer or lotion before you put on your foundation.
The description of a "primer" from the Laura Mercier website says:
Just as a painter "primes" a canvas, Foundation Primer - the original - was created by Laura Mercier in 1995 to "prime" the skin. Foundation Primer is a lightweight, creamy gel - used prior to foundation - that acts as an invisible barrier between skin and makeup that acts as a buffer to outside elements. This colorless gel leaves makeup looking fresh & colour-true the entire day.
Here is the site where you can order it.
http://www.lauramercier.com/products...dation_primer/
It also comes in Oil Free for oily skin.
http://www.lauramercier.com/products...imer_oil_free/
AND Hydrating if you have dry skin.
http://www.lauramercier.com/products...mer_hydrating/