Japanese sunscreen can be bought in domestic duty-free shops.

On T2 and T3, there are sales of Anna Sang, but it's hard to say whether there will be any on the day you leave. In fact, Annasun's sunscreen ability can only be said to be average, and it can only cope with the intensity of going out in Phuket. If you go out to sea, it is almost impossible to rely on Anna Sang, so it is not as effective as sunscreen products bought in local Boots and other drugstores.