I was way too excited to receive my Monistat from Drugstore.com so I could try it out as a primer for my foundation.
First, make sure you get the exact same product shown- the Chafing Relief- a silicone based product that creates a barrier on the skin to protect from chafing. Used by runners, and as a post wax soother, it quickly became a cult favorite among makeup artists since its ingredients are so similar to other big name primers.
I found the look and feel to be almost identical to dimethicone based primers but without fragrence. It absorbs right away and really does grab onto foundation- whether it be mineral, powder, or liquid- and hold the color for a full day.
Bottom line- for $8, I say go for it.