SPF 30+/PA++is enough. SPF value refers to the sun protection time. The higher the value, the longer the sunscreen time. But if it is too high, it will do more harm to the skin. SPF 30+/pa++ is enough. Apply it again after about three hours or when you are sweating heavily. I don't know if you have oily skin or dry skin. I have tried everything you said, and I have also used Mary Kay, Danzi, Polya and ZA.