You know, every nail polish lasts longer if the polish stays flexible.
Polish will stay flexible if it is regualrly oiled with a good cuticle oil. Are your friends and family using OPI Avoplex?
I'm sure if they look after their OPI manicure with OPI Avoplex then the polish will last longer. It is up to you to tell them and to supply them with it.
I use CND for everything .. every client walks out of the salon with CND Solar Oil ... because it is good aftercare that keeps a manicure lasting for a long time, and it is your job to see that clients have the things they need.
I recently got some "pinkie" sizes of solar oil to give to clients. Do you build the cost in to your service or charge extra, and if so, which size do you give them? Thanks! x