It's very important that your clients understand and sign a consent form before getting Spray Tanned. You can download this form and customize it for your own use. You can keep this form on file for your client, and place notes about which solution you used, skin type, etc. If there are any questions about whether or not to spray, it's better to ask questions and get a doctor's consent before spraying. If you are spraying a minor, always get parent's, or legal guardian's consent before spraying.
Many times your client will show up and not be prepared for their Spray Tan. This form explains what you need to tell your clients BEFORE they show up for their Appointment. This is great information to have at your front desk.
Use this video to train yourself, or your staff. You will develop your own technique over time, but this is a good place of reference.