Sunscreen has become a crucial part of recommended skincare routines, since it can protect our skin from harmful ultraviolet (UV) rays. If you’re like some people, you may diligently apply sunscreen every day in the morning as a part of your routine.
But, did you know that it's equally important to reapply it every two hours throughout the day? Today, we’re going to answer all of your sunscreen reapplication questions: do I need to reapply sunscreen indoors, what happens if I don’t reapply sunscreen, and why does sunscreen only last two hours? Let’s dive right in.
Why Does Sunscreen Only Last Two Hours?
Sunscreen, whether chemical or physical, has a limited lifespan once applied to the skin. It acts as a barrier between our skin and the sun's rays, absorbing or reflecting the harmful UV radiation. However, over time, the sunscreen's effectiveness diminishes due to various factors such as sunlight exposure, sweat, sebum production, and contact with water.
| UV Protection Decreases | The SPF rating only indicates the initial protection, and it gradually decreases over time. Reapplying sunscreen every two hours ensures a consistent shield against harmful UV rays, reducing the risk of sunburns, premature aging (like sun spots), and skin cancer. |
| Sweat and Sebum Dilutes & Washes Away | Physical activity, hot weather, and even daily activities can cause us to sweat and produce excess sebum. These fluids can dilute and wash away the sunscreen on our skin, leaving it vulnerable to UV damage. |
| Water Exposure | If you're spending time in water, whether swimming or sweating profusely, the sunscreen can easily be washed away. Even if a sunscreen claims to be water-resistant, it's crucial to reapply it once you're out of the water to ensure continuous protection. |
| Time & Sun Intensity | The strength of the sun's rays varies throughout the day. The intensity is highest between 10 a.m. and 4 p.m., when the sun is directly overhead. Reapplying sunscreen every two hours ensures that you maintain adequate protection during these peak hours when the risk of UV damage is highest. |
Do I Need To Reapply Sunscreen Indoors?
Since there’s minimal UV light indoors, the answer to this is generally “no” — but it depends. For example, if your office desk is right next to a window, that’s still UV exposure throughout the day, so you should stick to a reapplication schedule. Also try to keep in mind how long you’ve been inside, and when you’ll be going outside next. If you’ve been in for longer than an hour or so, reapply before going back out – it can’t hurt!
What Happens If I Don’t Reapply Sunscreen?
As you might imagine, we’re reapplying sunscreen so that we can avoid those negative effects of UV radiation. And remember, protecting your skin from the sun is not just a seasonal concern. Make it a habit to reapply sunscreen consistently throughout the year, regardless of the weather or your outdoor activities.
When you let your sunscreen’s protection lapse, you’re letting those UV rays through, opening yourself up to sunburn, premature aging, and even skin cancer. Sunscreen isn’t just a “one and done” product. Set a timer on your phone if you think you might forget! Your skin will thank you! And, if you’re looking for a lightweight, non-greasy facial sunscreen, we’ve got you covered. Check out our Mineral Facial Sunscreen today!