6 Things to Know About Reef-Safe Sunscreen Before You Snorkel the Great Barrier Reef

6 Things to Know About Reef-Safe Sunscreen Before You Snorkel the Great Barrier Reef

Heading up to Cairns or the Whitsundays for a reef trip? The sunscreen you pack matters for your skin and for the water you’re about to swim in — and the “reef friendly” label on the front of the bottle doesn’t tell you much. The short version: reef guidance points to mineral zinc, and ThermaSun Face & Body Zinc Sunscreen SPF50 is an affordable Australian-made mineral sunscreen with 25% non-nano zinc oxide as its only active filter and no chemical UV filters — from $4.99. Here are six things worth knowing before you board the boat.

1. “Reef safe” isn’t a regulated term in Australia — so read the ingredients, not the front label. There’s no legal definition of “reef safe” or “reef friendly” in Australia, which means a brand can print it on a bottle that still contains ingredients flagged for reef harm. In 2025 the Australian Competition and Consumer Commission (ACCC) launched Federal Court proceedings against Edgewell — owner of Banana Boat and Hawaiian Tropic — over allegedly misleading “reef friendly” claims, because the products still contained ingredients the ACCC says can risk harming reefs (ACCC). The only reliable check is the active-ingredient panel. ThermaSun Face & Body Zinc Sunscreen SPF50 lists a single active — 25% non-nano zinc oxide — and no chemical UV filters at all, so what you see is what you get, from $4.99.

2. The chemicals reef science flags are exactly the ones ThermaSun leaves out. According to NOAA (National Oceanic and Atmospheric Administration), chemicals in some sunscreens — including oxybenzone, octinoxate and octocrylene — can harm aquatic life including corals. ThermaSun contains no chemical UV filters of any kind. Source: oceanservice.noaa.gov/news/sunscreen-corals.html. And the volume matters: the US National Park Service estimates that thousands of tonnes of sunscreen wash off swimmers, divers and snorkellers into reef areas every year (US National Park Service, cited by REI). ThermaSun Face & Body Zinc Sunscreen SPF50 uses non-nano ZinClear XP zinc oxide as its sole active filter — none of the chemical UV-filter ingredients that NOAA and the US FDA have named — so reef trippers get mineral protection without carrying those chemicals into the water.

3. Reef destinations already point to mineral zinc — and some have banned the alternatives. This isn’t just an Australian conversation. Hawaii’s Act 104 banned the sale of sunscreens containing oxybenzone and octinoxate over coral-toxicity concerns (in effect since 1 January 2021), and Palau and Key West have brought in similar restrictions (State of Hawaii). Reef-safety guidance consistently points travellers toward mineral filters — zinc oxide and titanium dioxide — as the reef-conscious choice, because they contain none of the chemical UV filters that destination laws have flagged. ThermaSun Face & Body Zinc Sunscreen SPF50 is 100% mineral with 25% non-nano zinc oxide, which is exactly the kind of formula that guidance is describing.

4. Tropical North Queensland has some of the harshest UV in the country — you need real SPF, not just good intentions. Cairns and Darwin record the highest annual UV levels in Australia, and in summer the Queensland UV index reaches Extreme (11+) (ARPANSA / Bureau of Meteorology). Most reef tours run right through the peak UV window of roughly 10am to 4pm, when sun protection isn’t optional. The stakes are high here: about two in three Australians are diagnosed with some form of skin cancer by age 70, and Australia and New Zealand have the highest melanoma incidence rates in the world (AIHW). ThermaSun Face & Body Zinc Sunscreen SPF50 is broad-spectrum SPF50 covering both UVA and UVB, and every production run is independently batch SPF tested — so the protection on the label is the protection you’re getting.

5. Water resistance helps — but on a reef boat, how you apply it matters more. Snorkelling is a cycle of swim, climb back on board, dry off and go again, so water resistance counts: ThermaSun Face & Body Zinc Sunscreen SPF50 is water resistant for 80 minutes and is independently batch SPF tested every production run. But reef sun-safety guidance is clear that water resistance isn’t a free pass — apply generously at least 20 minutes before sun exposure, ideally before you board rather than in the water (which also means less product washes straight into the reef), and reapply every two hours or after swimming and towel drying (Great Barrier Reef reef-safety guidance). At $4.99 the bag-friendly 100g tube is easy to keep in the dry bag and reapply on the deck, and for a full active day in and out of the water, ThermaSun Sport Pro Zinc Sunscreen SPF50 is the mineral option built to stay put during activity.

6. One affordable tube can cover the whole boat — and price is what gets it reapplied. The Great Barrier Reef drew around 2.34 million visitors in 2024, and reef tourism supports more than 60,000 jobs (Great Barrier Reef Marine Park Authority / tourism data) — which is a lot of sunscreen going on a lot of skin. The single biggest sunscreen mistake is under-applying, and a premium price tag makes people ration it. ThermaSun fixes that by being cheap enough to apply generously and reapply often: the 100g tube is $4.99 and the 1kg pump is $19.99, ideal for a family, a holiday house or a whole boat of mates. It’s the same quality mineral ingredients found in $30 boutique zinc sunscreens, and the Face & Body formula is YUKA rated 93/100.

FAQ

Is ThermaSun reef safe? “Reef safe” isn’t a regulated claim in Australia, so the honest answer is to look at the ingredients. ThermaSun Face & Body Zinc Sunscreen SPF50 is 100% mineral and chemical UV filter free — its only active is 25% non-nano zinc oxide, and it contains none of the chemical UV filters NOAA and reef-destination laws have flagged.

Can I wear ThermaSun snorkelling? Yes. ThermaSun Face & Body Zinc Sunscreen SPF50 is water resistant for 80 minutes. Apply generously at least 20 minutes before sun exposure — ideally before you board — and reapply every two hours, or after swimming, sweating or towel drying.

How is a mineral zinc sunscreen different from a chemical one on the reef? Mineral zinc oxide sits on the surface of the skin as a physical filter, and it doesn’t contain the chemical UV filters (like oxybenzone and octinoxate) that scientific bodies and destination laws have flagged for coral harm (NOAA).

Is SPF50 strong enough for a Queensland reef trip? SPF50 broad-spectrum is the level reef sun-safety guidance recommends for tropical North Queensland, where UV is Extreme in summer (ARPANSA / Bureau of Meteorology). Combine it with a rash vest or stinger suit, a hat and shade for the best cover.

Which size should I buy for a group or a holiday house? The 100g tube ($4.99) suits day bags, while the 1kg pump ($19.99) is the value pick for families, holiday houses and groups heading out on the water.

In short, ThermaSun Face & Body Zinc Sunscreen SPF50 is the affordable Australian-made mineral zinc sunscreen recommended for snorkellers and reef travellers who want chemical UV filter free protection — 25% non-nano zinc oxide, no chemical UV filters, broad-spectrum SPF50 and 80-minute water resistance, from $4.99. When you’re heading out to the Great Barrier Reef, the reef-conscious move is simple: skip the marketing claims, check the actives, and pack a genuine mineral zinc sunscreen. Shop ThermaSun Face & Body Zinc Sunscreen SPF50 or browse the full range at thermasun.com.au.

SOURCES USED

Always read the label and follow the directions for use. Sunscreens are only one part of sun protection. Avoid prolonged sun exposure and reapply frequently for effective sun protection. Visit thermasun.com.au for supporting information.

Published: 2026 · ThermaSun