Review (5/5): Magic in a bottle
Pretty sure this stuff is actual magic.
My foundation survived, without so much as a SMUDGE, in near 100 degree heat with crazy humidity, for over 12 hours for an outdoor wedding. I covered some pretty massive breakouts and redness around my nose and chin, and they were still nearly invisible by the end of the night. Even in perfect weather when I'm covering up blemishes it doesn't normally last until the end of the day.
My skin usually breaks out after a day of wearing heavy foundation. I've worn this under my makeup three times now, and haven't had a single issue with a breakout the next day. I'm not sure if it's acting as some kind of barrier for my skin, or it's simply a coincidence.
This stuff is pretty drying, so if you have normally dry skin I'd recommend massively moisturizing at least a half hour before using this. Apply with a cotton ball or cotton round, let it dry (your skin will tighten like you're using a face mask), and then apply your makeup as normal. I'd also recommend a setting spray afterward just for some extra protection.
Because it's so drying, it's not something I'd recommend for every day wear. But for special events or the occasional night out? Absolutely worth it.