Hello Interloper!
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Personally. I don't widely advise liberal everyday use of sunscreen (except in Skin type 1 and 11 who transmigrate to high UV areas such as Queensland or Arizona) if it is solely used to stay in the sun for a longer period.
I must say I am a bit unsure about their medical benefit outside the clinically demonstrated proven benefits against non-melanomatous skin cancers. However, one should be aware of several epidemiological studies, which actually indicate an increased risk of malignant melanoma after the use of sunscreen.