Spray sunscreens are even worse than we thought: a laboured analysis

Summary

In this detailed exploration, Michelle, a chemistry PhD and cosmetic chemist, investigates the effectiveness of sunscreen sprays for reapplication without disrupting makeup. Through a series of experiments, she discovers that a significant amount of spray is lost due to evaporation, wind, and uneven application, resulting in less than a third of the product reaching the face. She also addresses safety concerns regarding inhalation and the upcoming changes in Australian sunscreen standards. Michelle concludes that while sprays have their uses, they are not the most effective for facial reapplication and recommends alternative methods for makeup preservation and sun protection.

Takeaways

• 🧪 Sunscreen sprays are less effective for reapplication than expected, with a significant amount of product not landing on the skin.
• 📏 The SPF rating on sunscreen labels is based on a standardized application of 2 mg per square cm, which may not be replicated in real-life use.
• 💧 Sunscreen sprays have both volatile (e.g., water and alcohol) and nonvolatile (e.g., active ingredients) components, with the volatile components causing issues with application.
• 🌬 Wind and air currents can significantly affect the application of sunscreen sprays, causing product to drift away from the intended area.
• 🤔 The amount of sunscreen applied with sprays is highly variable, with some products dispensing much more product per spray than others.
• 🔍 Experiments using UV cameras and paper masks showed that a small percentage of the sprayed sunscreen actually lands on the face.
• 🚫 The script strongly advises against spraying sunscreen directly into the face due to inhalation risks and uneven coverage.
• 🛡️ For body application, sunscreen sprays can be useful for quick application and are less likely to leave residue on body hair.
• 👚 Sunscreen sprays may be the best option for applying sunscreen to the scalp, more effective than powders.
• 👎 The main advantage of sprays—easy reapplication without messing up makeup—is overshadowed by their ineffectiveness and safety concerns.
• 🌞 The video emphasizes the importance of combining sunscreen use with other sun protection methods, such as seeking shade and wearing protective clothing.

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