Can you skip reapplying sunscreen after a swim with a water-resistant formula?
The UK's Which? consumer group tested SPF performance after exposure to saltwater or chlorinated pool water.
Water Contact Reduces Protection
Two sunscreens were evaluated: a popular store brand and a leading international product. After 40 minutes in saltwater, both lost significant effectiveness. The international product's SPF dropped by 60%.
Skincare expert Jetske Ultee notes on her site that no sunscreen is truly waterproof—hence "water-resistant." These formulas use waxes, oils, or polymers to resist water better, but protection still diminishes on contact.
Why Choose Water-Resistant?
If you're not diligent about reapplying, water-resistant options provide superior interim protection—even against sweat. For optimal skin safety, always reapply after swimming or toweling.
Consumers' Association Research
Edit 29/05: Their tests on sun sprays found 1 in 5 products fail to deliver promised protection. Read more on the Consumers' Association website.
