The NHS has issued urgent guidance on sunscreen use as Britain braces for its third summer heatwave, with temperatures nationwide set to exceed 30°C. The health service highlighted five common mistakes that reduce sunscreen effectiveness and provided advice on maximizing protection.
1. Applying Sunscreen at the Wrong Time
The NHS explained that most people apply sunscreen too late. For optimal protection, sunscreen should be applied twice before sun exposure: once 30 minutes prior to going outside and again immediately before heading out. This double application ensures a sufficiently thick layer and reduces the likelihood of missing areas.
Experts recommend using SPF 30 or higher for UVB defence, along with a high star rating of 4 or 5 stars for UVA protection.
2. Not Reapplying After Water Exposure
The guidance emphasized that sunscreen must always be reapplied after swimming, playing in the sea, or water fights. Even water-resistant products wash off. The cooling sensation of water can create a false sense of safety, while water reflects UV rays, increasing exposure.
The NHS still advises using water-resistant sunscreen for water activities, as it adheres better than standard sunscreen. However, it should be reapplied after towel drying, perspiring, or when it may have worn off.
3. Not Reapplying Sunscreen Regularly
"You should reapply every two hours – sooner if you have been in water," the NHS stated. Sunscreen requires liberal and frequent reapplication, following the manufacturer's instructions. This includes applying immediately after being in water, even if labeled "water resistant," and after towel drying, perspiring, or when it may have worn away.
4. Using Out-of-Date Sunscreen
The NHS warned against using expired sunscreen, as it "won't provide effective protection from the sun." To check if sunscreen is still safe, look for a symbol with an open lid, the letter M, and a number, indicating how many months the product remains effective after opening.
5. Relying Only on Sunscreen
The NHS urged people to wear suitable clothing and seek shade during peak sun hours, typically between 11am and 3pm in the UK. Loose-fitting, covering garments made from tightly woven fabrics are recommended, along with a wide-brimmed hat and sunglasses to protect the face, neck, ears, and eyes.
