in the kit-kiehl's ultra facial

I use Kiehl's Ultra Facial Moisturizer, in some way, on every shoot.  It works for most skin types and is so lightweight, it sinks right into the skin leaving it soft, nurtured and primed for foundation (or nothing at all).
Besides being my favorite everyday moisturizer, I find that Ultra Facial is also

a. an awesome picker-upper of any excess/errant product that should happen to fall where you don't want it (powder eyeshadow that wanders during application for example).  dip a cotton swab/tige in a bit of ultra facial and dab lightly over the area in question.

b. a superb mixing and thinning medium for my favorite concealer in the world, to achieve lighter coverage or when custom blending a shade.