Recommendations for a Lighter and More Economical Bath Oil

To make your bath oil less viscous and more economical while using a base like Oil Soap (MIPA Laureth Sulfate), the most effective approach is to adjust the oil phase of your formula.

As suggested, replacing some or all of the heavier oils you currently use with lighter oils will significantly reduce the overall viscosity. Suitable options include:

• Fractionated Coconut Oil: This oil is lightweight, non-greasy, easily absorbed, and generally more stable and less expensive than many other natural oils.
• Mineral Oil (Paraffinum Liquidum) Light or Very Light: Mineral oil is a cost-effective emollient that provides a smooth feel without being heavy. Using a lighter viscosity grade (like 15cst or 5cst) will help reduce the final product's thickness.

By substituting heavier oils with these lighter alternatives, you can achieve a less viscous product and potentially lower your ingredient costs.

Regarding adding water to the formula, this is generally not recommended for bath oils based on oil-soluble surfactants like MIPA Laureth Sulfate. These formulations are designed to be primarily oil-based and emulsify upon contact with bathwater. Adding water directly to the concentrated oil base would likely cause instability and separation, compromising the product's performance and appearance.