Apparently, sunscreen removes the invisible ink that Valleyfair! uses for your re-admission to the park.

We went last week.  I ran out to the car to put on sandals (so my socks wouldn’t get wet when we went on the water rides) and reapply sunscreen.  I got my arm stamped like I always do.  When I came back to the gate, she looked at my arm and couldn’t find the stamp.  She asked if I had put on sunscreen and told me that washes it off.  That information would have been good to know BEFORE I reapplied it!!!

Lucky for me, I still had my half of my ticket, so she let me back in.  It would have been big trouble if she hadn’t!