Physical Sunscreen Formula Questions

Adding WaterGuard™

Regarding adding WaterGuard™ to your physical sunscreen formula, the recommended usage rate for sunscreen products is typically 1.0-5.0%. WaterGuard™ is a polymer designed to create a waterproof/sweat-resistant film on the skin. It is soluble in alcohol but not in oil. Your formula uses Warp Cream Maker™ to create a water-in-silicone emulsion. You would need to ensure compatibility with your specific formula type and consider how to best incorporate WaterGuard™, potentially by dissolving it in a suitable solvent (like alcohol, if present or compatible) before adding to the main emulsion, or following specific instructions for use in water-in-silicone systems if available for the product. Always start with the lower end of the recommended range and test the stability and performance.

Adding Silk Talc Powder

Yes, you can add Silk Talc Powder (such as Talc Powder (5 Micron, Silane Coated) or Talc Powder (10 Micron, Silane Coated)) to your sunscreen formula. As previously mentioned, it's important that the formula has sufficient viscosity to keep the powder dispersed and prevent settling. If the formula is too liquid, you can increase the viscosity by adding Silicone Gel (Medium Matte, Dimethicone Base) as suggested. Mix the talc powder thoroughly to ensure even distribution in the formula for a smooth, powdery feel on the skin.

Cleansing Formula Question

Effectiveness of Cleansing Formula

Your proposed cleansing formula containing Water, PEG-7 Glyceryl Cocoate (Coco Wash™), Glycerin, and Propylene Glycol is a gentle, water-based cleanser. PEG-7 Glyceryl Cocoate is a mild non-ionic surfactant suitable for makeup removal and provides a soft feel, while Glycerin and Propylene Glycol act as humectants and solvents.

This formula should be able to remove some of the sunscreen components. However, physical sunscreens containing high percentages of Zinc Oxide and Titanium Dioxide dispersed in silicone (like Cyclomethicone) can be quite adherent and water-resistant. As suggested previously, increasing the concentration of PEG-7 Glyceryl Cocoate and Propylene Glycol slightly (e.g., PEG-7 Glyceryl Cocoate to 10% and Propylene Glycol to 15%) may improve its cleaning efficiency for removing the sunscreen.

For more effective removal of silicone-based sunscreens, a cleansing product that contains a silicone oil (like Cyclomethicone or Dimethicone) would be more efficient as silicones act as solvents for other silicones and many sunscreen filters. However, incorporating silicone oil would require a different type of formulation, such as a cleansing oil or balm that emulsifies with water, often utilizing an emulsifier like Warp Cream Maker™ designed for water-in-silicone or oil-in-water systems, mixed to be a liquid consistency. Your current water-based formula is a good starting point, and adjusting the percentages of the existing ingredients is the simplest way to potentially improve its performance without changing the formula type.