Our expert says:
You need to use a sunblock instead of a sunscreen. Sunblock usually has no SPF rating. The down side is that it is often gooey and unpleasant to use. What about using a good quality golf umbrella to shade you with your sunscreen?
Glass acts like a sunscreen, it does not block all the UV radiation but it does block the most dangerous short wavelength ultraviolet light.Longer wavelength ultraviolet light can pass through, which is less harmful than the shorter wavelength variety, but you can still tan or burn if you get enough exposure.
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