Hi I've just bought a spray tan kit today with tent , solution etc but I'm needing people to practise on. I got 770ml free solution & I was thinking of just using that to practise but I don't know what to say to people to ask them to do one on them what if it turns out a mess ? whats the best thing to explain to them to let them know I'm practising and that's why their getting it done for free please help thank you xx