SPF Mistakes Even Skincare Lovers Still Make
From under-applying sunscreen to relying on makeup SPF alone, these are the everyday habits quietly sabotaging your skin protection.
When it comes to skincare, most people know SPF matters. But according to skin experts, many skincare lovers are still making simple mistakes that can significantly reduce the protection their sunscreen actually delivers.
And in 2026, SPF conversations are bigger than ever. Between rising awareness around skin longevity, pigmentation and collagen preservation - alongside increasing misinformation online - sun protection has become one of beauty’s most talked-about topics.
Research continues to show that UV exposure is one of the leading contributors to visible skin ageing, including pigmentation, collagen breakdown and fine lines. Studies also show most people still fail to apply or reapply sunscreen correctly in real life.
Here are the SPF mistakes skin experts still see every summer.
1. Under-applying SPF
This is arguably the biggest SPF mistake of all.
Most sunscreen testing is carried out using 2mg of SPF per cm² of skin far more than most people apply day to day. Research suggests consumers often apply significantly less than the recommended amount, meaning the protection received may be much lower than the SPF number on the bottle.
For the face and neck, most skin experts recommend approximately:
• Two finger lengths of SPF
• Applied as the final step in your morning routine
This becomes even more important if you’re using active ingredients like vitamin A or exfoliating acids.
2. Forgetting to reapply
Applying SPF once in the morning is a great start - but it’s rarely enough during prolonged UV exposure.
Studies show between 20–60% of sunscreen users fail to reapply SPF properly depending on the situation.
Reapplication matters particularly when:
• Spending prolonged time outdoors
• Sweating
• Swimming
• Travelling
• Sitting near windows for extended periods
One of the biggest online conversations right now? How to realistically reapply SPF over makeup. Reddit skincare communities are filled with users discussing the challenge of balancing makeup wear with SPF top-ups throughout the day. There ARE sunscreens out there that can be applied over makeup, such as Reform Invisible Mist Spray SPF50. This formula is traceless on the skin and can be sprayed on the face and neck 15 minutes before sun exposure before reapplying every 2 hours during the day.
3. Relying on the SPF in makeup
SPF-infused makeup is everywhere right now thanks to the rise of “skinification” - the blending of skincare and makeup benefits.
But while complexion products containing SPF can add an extra layer of support, they rarely provide enough protection on their own because most people simply don’t apply them thickly enough.
Think of SPF makeup as a bonus, not your primary protection step.
Your dedicated sunscreen should still sit underneath makeup every day. IMAGE Skincare Daily Prevention Ultra Defence Moisturiser SPF50 is a great standalone sunscreen that absorbs quickly and doesn't leave a white cast.
4. Skipping SPF when it’s not sunny
One of the most common misconceptions in Ireland? That SPF only matters when it’s sunny.
In reality, UVA rays — the rays linked most closely to visible ageing and pigmentation — can penetrate cloud cover and glass year-round. This means daily incidental exposure during commutes, driving or sitting near windows still contributes to cumulative skin damage over time.
This is particularly relevant for:
• Pigmentation-prone skin
• Post-breakout marks
• Sensitive skin
• Anyone using active skincare ingredients
Daily SPF is less about beach days and more about long-term skin health habits.
5. Thinking SPF50 means you’re invincible
Higher SPF does not mean unlimited protection.
The HSE recently reminded consumers that sunscreen is “not a suit of armour” and should always be combined with additional sun-smart habits like shade, sunglasses and protective clothing.
Importantly, SPF numbers primarily measure UVB protection - not UVA protection, which plays a huge role in visible ageing. Recent research also found significant variation in UVA protection levels between SPF50 products.
In other words? Formula quality, application habits and consistency matter just as much as the number on the bottle.
The Bottom Line
Good SPF habits are less about perfection and more about consistency.
Daily broad-spectrum protection, realistic reapplication, correct application amounts and supporting your skin barrier all play a role in healthier-looking skin long term.
Because the smartest SPF routine isn’t the most complicated one - it’s the one you’ll actually stick to.