Just like the Greek father in the Big Fat Greek Wedding, I have two remedies that between them cover all problems: Camomile and yoghurt.

In this case it's yoghurt. Natural, mind, none of the namby-pamby fruity stuff. When sunburnt, especially for serious cases, plaster it on and leave for as long as possible. It cools, soothes, moisturises, avoids blistering, reduces existing blisters, and helps heal. It is also great having it licked off, but that's a different subject.

It would work well for prevention also. First you put on the foundation, then the rest of the makeup, and last thing, just before you leave the house, take a tub of yoghurt and cover your face with the stuff. Ignore strange looks - you know you're doing the right thing...