It can be done, but if it is more than 5% it may be necessary to use a helper to increase the stability of the formula such as ClayThick Ready Yes, if not more than 5%, the team thinks that there is no problem. Mixing, please use warm heat 60-70 degrees to help the formula mix better and easier. This will help the formula become more stable.If adding a group ซิลิโคน add another 5% to help blend. Can this be done?