In cosmetic formulation, the solubilizer is pre-blended cold with the small percentage of oils that require dispersion into an aqueous base. You can also add your preservative to the solubilizer blend if it contains an oil-soluble component such as Benzyl alcohol. When the aqueous base is homogeneous, slowly add the solubilizer blend. Some solubilizers can cause foaming so ensure you add them slowly. If your finished product appears cloudy, allow it to settle for around 48 hours. If it remains cloudy, change the solubilizer-to-oil ratio but always in line with the manufacturer's recommended usage percentage and instructions.