EN
NGÔN NGỮ
EN

How to Apply Sunscreen Properly for Full Protection

How to Apply Sunscreen Properly for Full Protection

Sunscreen is a crucial part of any daily skincare routine. However, many people apply it incorrectly, reducing its protective effects. In this guide, we’ll walk you through how to apply sunscreen properly—from how much to use, when to reapply, and which areas are commonly forgotten.

Why Applying Sunscreen Properly Is Important

Although sunlight has some health benefits, overexposure can seriously damage the skin. Ultraviolet (UV) rays can penetrate the skin deeply, even on cloudy days or through windows, and cause:

  • Sunburn

  • Dark spots and hyperpigmentation

  • Premature aging (wrinkles, fine lines)

  • Increased risk of skin cancer

Proper sunscreen use acts like a shield, helping to block or absorb harmful UV rays before they reach deeper skin layers. This prevents visible damage and long-term health risks.

How Much Sunscreen Should You Use?

Using too little sunscreen is a common mistake. Dermatologists recommend applying about 2mg of sunscreen per cm² of skin. This translates to:

  • Face: A dollop the size of a coin

  • Whole body (adult): About 30ml (2 tablespoons)

  • Children:

    • Under 3 years: 5–10ml

    • 3–5 years: 10–15ml

    • 5–10 years: 15–20ml

Make sure to adjust based on your body size and clothing coverage.

Step-by-Step: How to Apply Sunscreen Correctly

1. Apply 20–30 Minutes Before Sun Exposure

Give your skin time to absorb the sunscreen so it forms a protective barrier before you step outside.

2. Dot Sunscreen Before Rubbing In

Dot small amounts across your face or body. This ensures more even coverage compared to applying in a single blob.

3. Use Gentle Circular Motions to Rub In

Gently rub the sunscreen using small circular motions. Pat lightly to help absorption and avoid streaks.

4. Don’t Forget Commonly Missed Areas

Remember areas like:

  • Ears

  • Neck

  • Back of hands and feet

  • Hairline

  • Tops of ears

    For hard-to-reach spots like the back, try using spray sunscreens.

When and How to Reapply Sunscreen

How Often to Reapply?

Every 2–3 hours, or immediately after:

  • Swimming

  • Sweating

  • Towel drying

Even high SPF products require reapplication for continued protection.

Reapplying Tips:

  • No makeup: Simply reapply and rub in.

  • With makeup:

    • Remove makeup and sunscreen, then reapply both

    • Or use sunscreen spray or powder designed for use over makeup

Sunscreen Is Needed Even Indoors

Tanning indoors? Think again. Blue light from screens and UV rays through windows can still damage skin. Always apply sunscreen, even when staying at home or working under artificial lights.

Watanabe Yuzu
Latest posts by Watanabe Yuzu (see all)