As dermatology and outdoor safety experts, we often get asked about layering sun protection with insect repellents. If you're using both sunscreen and DEET-based mosquito repellent, don't apply them simultaneously—it can reduce their effectiveness.
Start with sunscreen, allow it to fully absorb for about an hour, then apply DEET. Note: DEET is not waterproof; reapply after any water contact.
