When do I need to apply SPF?

October 10, 2024

When to Apply SPF: A Guide to Protecting Your Skin

Sunscreen, or SPF (Sun Protection Factor), is one of the most essential steps in any skincare routine, yet many people underestimate when and how often to apply it. Whether it’s a blazing summer day or a chilly, overcast afternoon, harmful UV rays are constantly present and can cause long-term skin damage, premature aging, and even skin cancer. But knowing the right moments to apply SPF can make a world of difference in maintaining healthy, youthful skin.

In this post, we’ll break down when you should be using sunscreen, from daily habits to special occasions, to ensure your skin is protected all year round!

what is SPF?

SPF, or Sun Protection Factor, is a measure of how well a sunscreen protects your skin from ultraviolet B (UVB) rays, the type of radiation from the sun that causes sunburn and can contribute to skin cancer. The SPF number indicates how long it would take for UVB rays to redden your skin compared to if you weren’t wearing any sunscreen.
For example, if you’re using an SPF 30 product, it means it would take 30 times longer for your skin to burn than if you weren’t wearing any sunscreen. However, SPF doesn’t measure protection against ultraviolet A (UVA) rays, which penetrate deeper into the skin and cause long-term damage like aging and wrinkles. That’s why it’s essential to choose a broad-spectrum sunscreen, which protects against both UVB and UVA rays.
The higher the SPF number, the greater the protection, but it’s important to apply the sunscreen properly and reapply regularly for it to be effective.

Using SPF correctly is key to ensuring you get full protection from the sun’s harmful UV rays. Here's a step-by-step guide on how to use SPF effectively:

1. Choose the Right SPF
Broad-Spectrum SPF:

Always opt for a sunscreen labeled “broad-spectrum” to protect against both UVA and UVB rays.

SPF Rating: For daily use, SPF 30 is generally recommended. If you’re spending extended time outdoors, opt for SPF 50 or higher.

Water-Resistant: If you plan on swimming or sweating, choose a water-resistant formula, but remember to reapply regularly.

2. Apply Generously
Amount: Use enough sunscreen to fully cover your skin. The general guideline is about a shot glass (2 tablespoons) of sunscreen for your body and about a nickel-sized dollop for your face.

Face and Ears: Don’t forget to cover often-missed spots like the ears, neck, and back of your hands.

3. Timing Matters
Apply Before Sun Exposure: Apply sunscreen at least 15-30 minutes before you go outside to give it time to absorb and form a protective barrier.

Reapply Every 2 Hours: Reapply every two hours, and more frequently if you’re swimming or sweating.

4. Use SPF Daily
Even on cloudy days or during winter, harmful UV rays can still reach your skin. Make SPF part of your daily routine, even if you’re staying indoors (UVA rays can penetrate through windows).

5. Layer with Other Products
Order: If you’re using other skincare products like moisturizer or makeup, apply your SPF as the last step in your skincare routine. If you’re using SPF makeup, it’s not enough on its own, so always apply sunscreen underneath.
By following these steps, you’ll ensure your skin stays protected, healthy, and glowing!

When should you apply SPF?

You should apply SPF every day, regardless of the weather or season, to protect your skin from harmful UV rays. Here’s a breakdown of the key times you should be applying SPF:

1. Every Morning as Part of Your Routine
Daily Protection: Even on cloudy or cold days, UV rays are present and can cause damage. Incorporate SPF into your morning skincare routine, applying it as the last step before makeup.
2. At Least 15-30 Minutes Before Sun Exposure
Apply your sunscreen 15-30 minutes before heading outdoors to allow the sunscreen to fully absorb and form a protective layer on your skin.
3. When Spending Time Outdoors
Direct Sunlight: If you’re planning to be outdoors for extended periods, apply a higher SPF (30 or more). This includes outdoor activities like hiking, swimming, or gardening.
Winter and Cloudy Days: Even when it’s cold or overcast, UV rays can penetrate clouds and still harm your skin, so SPF is necessary year-round.
4. During Water and Outdoor SportsIf you’re swimming, sweating, or doing outdoor sports, reapply every 2 hours or immediately after getting wet, using a water-resistant sunscreen.
5. When Indoors Near Windows
UVA Rays Can Penetrate Windows: If you’re spending time indoors but sitting by windows or driving, you’re still exposed to UVA rays, which can cause premature aging. Apply SPF if you’re in such environments.
By applying SPF at these key times, you’ll be protecting your skin from both short-term and long-term sun damage!

Sunscreens that we recommend:

La Roche-Posay Anthelios UVMune 400 Invisible Fluid Non-Perfumed Suncream SPF50

La Roche-Posay Anthelios UVMune 400 Invisible Fluid SPF50 is a lightweight, non-perfumed sunscreen designed to offer high-level protection against both UVA and UVB rays. Its advanced UVMune 400 technology ensures enhanced defense, particularly against long-wave UVA, while its invisible fluid formula absorbs quickly without leaving a greasy or white residue. Suitable for all skin types, including sensitive skin, this water-resistant suncream is perfect for daily use, offering broad-spectrum protection in a skin-friendly, fragrance-free formulation. Ideal for those seeking effective sun protection with a barely-there feel.

COSRX Aloe Soothing Sun Cream SPF 50+++

COSRX Aloe Soothing Sun Cream SPF 50+++ is a hydrating sunscreen that offers broad-spectrum protection while soothing the skin with aloe vera. With SPF 50+ and PA+++, it effectively shields against both UVA and UVB rays, preventing sunburn and long-term skin damage. The lightweight, non-greasy formula absorbs quickly without leaving a white cast, making it perfect for daily use. Enriched with aloe vera extract, it provides deep hydration and calming benefits, making it especially suitable for sensitive or dry skin. This sun cream not only protects but also nourishes, leaving your skin feeling soft and moisturized all day.

to sum up...

In conclusion, applying SPF is a vital step in protecting your skin from the harmful effects of the sun. Whether you’re indoors near windows, heading outside on a cloudy day, or spending a day at the beach, using sunscreen regularly helps prevent sunburn, premature aging, and reduces the risk of skin cancer. By making SPF a part of your daily routine and reapplying it as needed, you can keep your skin healthy, radiant, and well-protected all year round. Don’t skip it—your future skin will thank you!