does sunscreen actually stop the tanning process or just prevent burning?

I think it just slows both down.

Depends on what kind of lotion you get.

regular sunscreen, ive been in brazil for acouple months studying on an exchange program. despite what you might think about brazil ive been here during the fucking rainy season. sometimes for a week strait it will rain here.

anyway, im traveling to porto seguro, bahia tomorrow for a week and id like to get tan and not burned, obviously. yes im pretty fair skinned

Maybe it is pretty obvious, but why the hell do I get sunburned in the middle on January when its 30 degrees out after I have been outside for a while? Am I complete genetic oddity? (By the way I am about 99.9999999% irish and I become a lobster in the summer)