If one sunscreen isn't enough, does layering two help?

On Taiwan's PTT forum (BeautySalon board), someone ran a small experiment: innisfree's green tea sunscreen serum on one arm, Kosé's Suncut on the other, then a normal day of commuting, classes and a lunch run, with no reapplication. The Suncut arm tanned, confirmed by three people. But the innisfree one handles sweat less well, the poster sweats a lot in summer, and had bought several Suncut tubes for the collaboration packaging. The question: use double the Suncut, layer Suncut over innisfree, or wear innisfree in the morning and top up with Suncut at noon?

Out of 30-plus replies, the most useful points:

• If you are not wearing makeup, wash or wipe off the morning layer before reapplying.

• Check ingredients before layering different brands. One person found avobenzone in one product and octinoxate in the other and considered the pairing unstable; another added that some products stabilise filters by encapsulating them.

• Quite a few said they tanned with Suncut too, and now keep it for cloudy days or winter.

• Some argued that whether you tan depends on whether the formula has enough filters covering long-wave UVA; reapplying more often cannot fix a formula gap.

• Others simply asked: why not use the same product in the morning and at noon?

The general lean: rather than engineering a layering combo, pick one sunscreen that is strong enough, apply plenty, reapply on time, and add a jacket, hat or umbrella.

Desk note: The American Academy of Dermatology advises applying sunscreen generously and reapplying every two hours, and after sweating or towelling off. A one-day arm test has many variables (amount, sweat, rubbing), so get "enough product, reapplied on time" right first, then compare products.

Do you ever layer two sunscreens, or stick with one all day?

Original thread: PTT BeautySalon board — sunscreen layering question · Source: American Academy of Dermatology

#Sunscreen #SunscreenLayering #UVFilters