How Long Does Bug Spray Actually Last? (The Honest Answer)

"Does bug spray expire while you're wearing it?" It's one of the most common questions we hear — and the answer depends entirely on what's in your spray and how you're using it.

The Short Answer: It Depends on the Active Ingredient

Why "Up to 12 Hours" Is Often Misleading

• Sweating: Each sweat episode washes off 20–40% of protection
• Swimming/water: Removes most repellents within minutes
• Heat: High temperature accelerates evaporation of active compounds

The Golden Rule: When to Reapply

• After swimming (even if "waterproof")
• After heavy sweating or physical activity
• Every 2–3 hours in high-mosquito environments

How to Apply for Maximum Duration

1. Apply to all exposed skin — don't miss ankles, wrists, and neck
2. Apply 15–20 minutes before going outside
3. If using sunscreen, apply sunscreen first, repellent second
4. Avoid open cuts, eyes, and mouth