I have a client who is very very pale, I have sprayed her few times and not much colour is showing up, we first used Santana medium 10% to see how colour would be with that, then used dark 12% still not much colour and white looking then I used a different brand 16% and still not much darker, there is a very slight colour but her legs from knee down still white, she has followed all the care before getting sprayed and still this is happening, is there any other solution or should use darker shade or is she just never going to tan?thanks x