Waterproof sunscreen can be good, but it's important to understand its limitations.
While the term "waterproof" is no longer allowed on sunscreen labels by the FDA, sunscreens labeled as "water resistant" are designed to maintain their effectiveness for a period of time after water exposure. These sunscreens are typically tested to be effective for either 40 minutes or 80 minutes of swimming or sweating.
Understanding Water Resistance
- Water Resistant (40 minutes): This sunscreen is effective for up to 40 minutes of swimming or sweating.
- Water Resistant (80 minutes): This sunscreen is effective for up to 80 minutes of swimming or sweating.
Key Considerations:
- Reapplication is Crucial: Even "water resistant" sunscreen needs to be reapplied after the specified time (40 or 80 minutes) of swimming or sweating, and immediately after towel drying.
- Not Truly Waterproof: No sunscreen is truly waterproof or sweatproof. The term "waterproof" has been removed from sunscreen labeling due to its misleading nature.
- Application Timing: Apply sunscreen 20-30 minutes before sun exposure to allow it to bind to the skin.
- Generous Application: Apply a generous amount of sunscreen. A general guideline is about one ounce (two tablespoons) to cover the entire body.
- Broad Spectrum Protection: Look for sunscreens that offer broad-spectrum protection, meaning they protect against both UVA and UVB rays.
In summary, "water resistant" sunscreen can be a valuable tool for sun protection, but its effectiveness is limited. Frequent reapplication and proper use are essential to ensure adequate protection from the sun's harmful rays.
