Using PVP in Foundation or Sunscreen for Water Resistance

Yes, certain types of PVP can be used in foundation or sunscreen formulations to help achieve water resistance.

Specifically, Triacontanyl PVP is commonly used as a film former in sunscreen formulations to make them more waterproof and help increase the SPF value. It can also be used in makeup formulations to improve water resistance and help disperse pigments.

Other types of Polyvinylpyrrolidone (PVP), such as PVP-K15, PVP-K17, PVP-K30, PVP-K60, and PVP-K90, are primarily described for use in hair styling products as hair fixatives or in face masks as thickeners/film formers. While they are film-formers, Triacontanyl PVP is the one specifically highlighted for its waterproofing benefits in sunscreen and makeup based on the available information.

Therefore, if your goal is to add water resistance to your foundation or sunscreen formula, Triacontanyl PVP would be the most suitable choice among the PVP options described.