How do spray tans work ? Help me pleas girls x

How do spray tan work? My big birthday bash Saturday and I was going to do my own tan. However im going to get a spray tan, but how do they work? When's best to get one if I'm going out on the Saturday? If I got one thurs/fri.. Would I be able to go in the shower still and SHAVE before I went out Saturday ? I don't want it to go bloody or look stupid. I need to know how this works

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