Order of activation in a multi-function product
1) There are multi-function products whose functions need to happen in a certain order. For example, a cleanser and shaving cream would need to clean before providing a moisturized, slick surface with a layer of cushion or foam. How does the formulation ensure that such an order is achieved? Naively, one would not want the slickening ingredient to spread first and preventing the cleaning agent from getting to the grim or from removing the slick layer on the grime.
2) As another example, suppose good results are seen when three ingredients, a water based ingredient H, an oil A, and an oil B are applied in the order H followed by A followed by B. How would one create a single topical product containing H, A and B such that on application, H goes on first, followed by A followed by B?