Ingredients that can help increase the staying power.. of watery products
What are some ingredients (either as general categories or as specific examples) that can help increase the staying power of ingredients in water type products when applied to the skin?
What I mean is-something that somehow increases your ingredients to stay longer on skin without being easily washed away, for ex, by sweat, so that the effect can last longer.
What have often been used by formulators?
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