i know a bunch of sun burn home remedies. i'm a natural redhead. i used to tell people i was caspers' little sister, since i am so pale. i literally burn in 10 minutes.
cold milk compresses. raw works best, but skim won't really help. 1 or 2% works best.
cucumber. wash a cucumber, put it in the blender, apply the paste wherever. you can mix milk with it, too.
cider vinegar compresses or a cool bath with a cup or so of cider vinegar (also good for heat rashes or other minor skin irritations).
baking soda paste or a baking soda bath.
there's always good old noxema. it really does help, and it's quick.
i also use a vitamin e and aloe lotion, after the first day or so.
i have tried all of these, on myself and my kids, who are not redheads, but are just as pale as their mama! we go thru gallons of sunscreen every year.