Sun Cream and Insect Repellent: How to Use Them Together
TL;DR — the quick answer
- Apply sunscreen first, let it absorb for around 15 minutes, then apply insect repellent on top.
- Reapply sunscreen every 2 hours (and after swimming or heavy sweating); most repellents last longer and need far fewer top-ups.
- Do not skip either one — sunburn and mosquito- or tick-borne illness are both real risks on a summer day outdoors.
- Choose a DEET-free repellent (such as one based on PMD) if you want to avoid the plastic-damaging, SPF-reducing downsides sometimes linked to DEET.
- A well-formulated 2-in-1 SPF + repellent can simplify the routine, as long as you still reapply it often enough for sun protection.
On a hot day by the water or on a hike, you often need two kinds of protection at once: sun cream against UV and insect repellent against mosquitoes and ticks. Used in the wrong order — or at the wrong intervals — they can undercut each other. Here is how to layer them correctly so both actually work.
Sunscreen or repellent first?
The consensus from public-health bodies is simple: sunscreen goes on first, repellent second. Apply sunscreen to clean, dry skin and give it about 15 minutes to bind and absorb. Then apply your insect repellent as the outer layer, because repellent is designed to sit on the surface of the skin where biting insects make contact.
If you reverse the order and put repellent underneath, a fresh layer of sun cream on top can dilute or partially cover the repellent film, reducing how well it deters insects.
Why the order and timing matter
The two products have very different jobs and very different lifespans:
- Sunscreen is consumed as it protects — it degrades in UV light, rubs off on towels and clothing, and washes away in water. That is why it needs frequent reapplication.
- Repellent works by creating a vapour barrier that discourages insects from landing and biting. It generally lasts several hours from a single application and should not be over-applied.
This mismatch is the crux of the problem. If you reapply a combined dose every time you top up sun cream, you can end up applying far more repellent than you need. The safer approach is to treat them as two separate steps on two separate clocks.
Does repellent reduce SPF?
Some studies have found that applying repellent over sunscreen can modestly lower the effective SPF. The practical fix is not to skip repellent — it is to apply sunscreen generously and reapply it on schedule, so any small reduction is more than offset.
Sunscreen vs. repellent: a quick comparison
| Sunscreen | Insect repellent | |
|---|---|---|
| Apply | First, to dry skin | Second, over the sunscreen |
| How it works | Absorbs or reflects UV rays | Deters insects from landing and biting |
| Reapply | Every 2 hours, and after swimming or sweating | Every few hours as the label directs — far less often |
| Over-application | Encouraged — most people use too little | Avoid — use only as directed |
How often should you reapply each?
Follow the sunscreen clock, not the repellent clock:
- Reapply sunscreen every 2 hours, and immediately after swimming, towelling off, or heavy sweating.
- Reapply repellent only as its label directs — typically after several hours, or sooner if you have been in water.
- When you do need to refresh both at the same time, reapply sunscreen first, wait a few minutes, then reapply repellent.
Are 2-in-1 sunscreen and repellent products worth it?
Combination products are appealing because they collapse two steps into one — useful with fidgety children or when you are travelling light. The historic caution against them comes largely from DEET-based combinations: DEET can degrade some sunscreen filters and can damage plastics, and repeatedly reapplying a DEET blend on the sunscreen schedule means more DEET on the skin than necessary.
A DEET-free 2-in-1 avoids the plastic and SPF-degradation concerns tied to DEET. The one rule that still applies to any combined product: you must reapply it often enough to keep the sun protection valid — roughly every two hours in strong sun. If you are happy to do that, a good 2-in-1 is a genuinely convenient option.
A simple routine for a day outdoors
- Apply sunscreen to dry skin ~15 minutes before going out.
- Apply repellent over the top, covering exposed skin.
- Every 2 hours (and after swimming): reapply sunscreen, wait a few minutes, then refresh repellent if needed.
- Wear light, long clothing and check for ticks after time in grass or woodland.
How incognito® helps
If juggling two bottles and two timers feels like a lot, our Mineral Sunblock & Insect Repellent SPF30 combines reef-safe SPF30 mineral sun protection with our DEET-free, plant-based repellent in a single step — vegan, biodegradable and made in the UK. Prefer to layer separately for maximum sun cover? Pair your own sunscreen with our clinically proven, DEET-free incognito® insect repellent spray, which uses PMD (Citrepel®) and is recommended against both mosquitoes and ticks. Whichever you choose, reapply sunscreen on schedule and you are covered on both fronts.
FAQs
Should I put sunscreen or bug spray on first?
Sunscreen first. Let it absorb for about 15 minutes, then apply insect repellent as the top layer.
Does insect repellent stop sunscreen from working?
It can slightly lower the effective SPF, but the fix is simply to apply sunscreen generously and reapply it every two hours — not to skip repellent.
Can I use a 2-in-1 sunscreen and repellent?
Yes, especially a DEET-free one. Just remember to reapply it every couple of hours so the sun protection stays effective.
How often do I reapply each product?
Reapply sunscreen every 2 hours and after swimming or sweating. Reapply repellent far less often — only as the label directs.
Is DEET-free repellent better with sunscreen?
A DEET-free repellent such as one based on PMD avoids the plastic damage and SPF-degradation sometimes linked to DEET, which makes it a practical partner for sun cream.
Sources
- CDC — Prevent Mosquito Bites
- EPA — Skin-Applied Repellent Ingredients
- NHS — Sunscreen and Sun Safety
- FDA — Sunscreen: How to Help Protect Your Skin from the Sun
- ECDC — Protective Measures Against Mosquitoes
This article is for general information only and is not medical advice. Always follow the usage and age guidance on each product label, and consult a healthcare professional for personal concerns.