I got my tanning kit today & I also got tanning solution with it i got 7 little bottles of 110ml each the tans % ranges from 8% , 10% , 12% , 14% , 18% then like a fast tan like a 2 hour tan but I can't really afford to buy all these tans in when all 110ml's are finished .. Should I just buy in like 8 10 & 12 % because these will probably be the only colours I will need ??? Or will I need to buy them all in .. Thank you xxx