Sunscreen Formula Modification: Waterproof, PA+++, Light Texture

Question

I would like to modify a sunscreen formula obtained from the website myskinrecipes. The original formula example provided uses:

SPF Protect Ultra™ II 15%
Milk Lotion Maker™ 3%
Satin Cream Maker™ 0.7%
Water 80.3%
Mild Preserved Eco™ 1%

I need assistance adjusting this formula to be waterproof and achieve PA+++. The desired properties for the final product are:

Light texture
Non-whitening (no white cast)
Easy to spread
Non-greasy
Non-sticky

Could you please provide the required percentage of each ingredient and the detailed steps for making this modified formula?

MySkinRecipes Expert · Accepted Answer

Waterproof Sunscreen Formula with PA+++

Here is a modified sunscreen formula based on your request, designed to be waterproof, achieve PA+++, and have a light, non-greasy texture.

Formula:

SPF Protect Ultra™ II: 30%
Milk Lotion Maker™: 3%
Satin Cream Maker™: 0.7%
UV35: 5%
Mild Preserved Eco™: 1%
Water: 60.3%

Instructions:

Oil Phase: Combine SPF Protect Ultra™ II and Milk Lotion Maker™. Heat this mixture to 70°C and mix until homogeneous.
Water Phase: In a separate container, combine Water, Mild Preserved Eco™, and UV35. Heat the water to 60-70°C. Mix the water phase ingredients until dispersed/dissolved.
Emulsification: While continuously mixing the Oil Phase, gradually add the heated Water Phase. Continue mixing until a uniform emulsion is formed.
Thickening: Add Satin Cream Maker™ to the emulsion. Mix thoroughly for at least 15 minutes to ensure it is fully dissolved and the desired texture is achieved. Avoid high-speed mixing (above 2500 rpm).
Cooling and Final Check: Allow the mixture to cool. Ensure the formula is homogeneous before packaging.

This formula uses a higher concentration of SPF Protect Ultra™ II to enhance UVA protection and includes UV35 for water resistance and an additional SPF boost. The combination of emulsifiers helps create a light, easy-to-spread texture.