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" ... Also important? Understanding is the difference between chemical and physical sunscreens. Since physical ones sit on top of the skin, they form a physical barrier (hence, their name) between the skin and damaging UV rays. In addition: they work immediately upon applicaton, are broad spectrum (meaning they protect against both UVA and UVB rays), and less prone to irritating sensitive skin. The one downside is that, according to Ross: “They can be a little thicker and less blendable than chemical sunscreens.” ... "