Blistered. Severely. This is my forearm, above the sleeve line. Riding a motorcycle, the sleeves flutter in the breeze and the sun gets you here. I know this from long experience and use sunscreen.
The sunscreen I used just flat did not work.
Upper chest and the other forearm were as bad.
Damage was done on the outbound ride before I realized it. Back to the brand I’ve always used (Bullfrog sport spritz-on, which always works).