Water-resistant doesn't mean waterproof. There's no sunscreen that can fully withstand a dip in the pool or the ocean. Water-resistant sunscreens are formulated to stay on wet skin a little longer, but they should still be reapplied every 40 to 80 minutes usually, depending on the product's instructions. And towel-drying? That rubs sunscreen off, so you'll need to reapply after drying off even if it hasn't been 80 minutes.

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