Several times a week, I’m out on the water for three to five hours at a stretch, in full sun, paddleboarding. That much exposure adds up, so I’ve put money and time into sunscreen: trying different brands, comparing formulas, and reading past the marketing to find better ways to protect my skin.
I started as a purist. Mineral only, reef-safe only, sprayed on before every paddle and reapplied like clockwork.
Two summers and four sunscreens later, only one bottle is still the reef-safe purist pick, and I reach for the other three more often than I expected.
I have short hair, so the sun finds the tops of my ears, my nose, and my scalp within the first half hour on the water. There is no shade in the middle of a lake.
Key Takeaways
- “Reef safe” is not regulated. The FDA does not define or test the term. In practice it means a product leaves out oxybenzone and octinoxate.
- Passing Hawaii’s ban does not make a sunscreen reef-clean. Three of my four bottles contain octocrylene, a filter that clears Hawaii but is banned in the U.S. Virgin Islands and Palau.
- Only the mineral one clears the bans. Of my rotation, the zinc-based Sun Bum Mineral SPF 50 spray is the single bottle whose filters are legal everywhere on the current ban lists. Clearing the bans is a smaller claim than being harmless.
- The reef science is far from settled. NOAA calls coral harm from sunscreen “an active area of research.” Lab damage is real; whether real-world ocean concentrations reach those levels is contested.
- SPF 30 blocks about 97% of UVB. Higher numbers add little, and nothing blocks 100%. Apply 15 minutes before sun and reapply every two hours.
- The U.S. just approved its first new sunscreen filter in about 25 years. Bemotrizinol cleared the FDA on June 9, 2026, at up to 6%, and the order took effect August 9, 2026. Nothing on a shelf could legally contain it before then, so expect American formulas to change in the 2027 season rather than this one.
For reef-safe protection on the water, I reach for the Sun Bum Mineral SPF 50 spray. It’s zinc oxide and titanium dioxide, its filters clear every ban on the books, and it sprays on fast.
What I Look for in a Sunscreen
My list has stayed mostly the same since I started.
- SPF 30 or higher, broad spectrum. That second term is a pass/fail test in the U.S.: a sunscreen either clears the FDA’s UVA threshold or it doesn’t, and one that scrapes past prints the same two words as one that sails through.
- Water resistant for the full 80-minute label claim
- Reef safe when I’m near sensitive water
- Not greasy, because I’m handling a camera all day
The greasy part was the hardest to solve. Most mineral sunscreens leave a film that makes keeping a lens clean miserable. I have asked friends to apply it to my back so my hands stayed clean enough for the gear. That film is what pushed me to try chemical formulas, and it’s why my dry bag now holds more than one bottle.
My Sunscreen Rotation, Filter by Filter
I bought all four myself and have paddled with each of them across a full season.
| Sunscreen | Filter type | Reef status | Best for |
|---|---|---|---|
| Sun Bum Mineral SPF 50 spray | Mineral (zinc oxide 16%, titanium dioxide 3.4%) | Filters clear every ban on the books; non-nano status not stated | Reef-safe days, sensitive water |
| Cancer Council Kids SPF50+ | Chemical (4-MBC, octocrylene, ethylhexyl triazone, avobenzone) | Passes Hawaii only. 4-MBC fails Palau and Thailand; octocrylene fails the USVI; non-mineral fails Maui County | Long, sweaty days; gentle finish |
| La Roche-Posay Anthelios Pro-Sport SPF 50 | Chemical (avobenzone, homosalate, octisalate, octocrylene) | Clears Hawaii; octocrylene fails the USVI and Palau; non-mineral fails Maui County | High-sweat effort, no white cast |
| Neutrogena Hydro Boost Water Gel SPF 50 | Chemical (avobenzone, homosalate, octisalate, octocrylene) | Not marketed reef-safe | Face, daily wear, under a hat |
Sun Bum Mineral SPF 50 (The Reef-Safe One)
This is the bottle I trust when I’m anywhere I’d feel bad leaving a chemical slick behind. It runs on zinc oxide 16% and titanium dioxide 3.4%, and it’s the only one in my bag that omits every chemical on the various ban lists. It costs around $20 for a 6-ounce can.
Sun Bum does not state on this bottle whether its minerals are nano or non-nano. Nano means particles under 100 nanometers, and NOAA flags nano zinc and nano titanium among its ten compounds of concern. Maui County’s ordinance permits specifically non-nanotized minerals, so an undeclared bottle is a question mark there. Brands that are non-nano tend to say so on the label, in large type, because it is a selling point.
The FDA’s 2019 proposed rule singled out spray and powder forms of zinc oxide and titanium dioxide as needing more inhalation data. Spray it onto your hands or onto skin rather than into a breeze near your face.
The trade-off is a faint white cast and that mineral grip on the skin. I’ve made my peace with both. The Sun Bum Mineral SPF 50 spray rubs in better than the mineral sprays I started with, though it still asks for a full rub-down.
Cancer Council Kids SPF50+ (The Australian One)
Cancer Council is the sunscreen line run by Australia’s cancer charity. I picked up the Cancer Council Kids SPF50+ because the kids formulas tend to be the gentlest on skin. It runs about $23 for a 110 ml tube, which makes it by some distance the most expensive sunscreen per ounce in the rotation.
Cancer Council Kids SPF50+ runs on 4-methylbenzylidene camphor (4-MBC) 4%, octocrylene 4%, ethylhexyl triazone 3%, and butyl methoxydibenzoylmethane 3%, which is avobenzone under its longer name. I took those figures from Cancer Council’s own product listing, and they match the published INCI databases.
Two of those four are not FDA-approved sunscreen actives, which is why you buy this as an import rather than off a shelf in Sacramento.
4-MBC sits on NOAA’s list of ten compounds of concern for reefs. Palau bans it, and Thailand bans it in every national marine park, with fines to 100,000 baht. The European Union prohibited it in cosmetics outright under Commission Regulation (EU) 2024/996 over endocrine-disruption evidence: no new products on the market from May 1, 2025, and nothing left on shelves from May 1, 2026.
I bought this bottle because Australia and Europe approve more sunscreen filters than the United States does, and 4-MBC is the filter Europe just banned.
It passes Hawaii’s two-chemical test and nothing else on the list. I still like how it wears on a long day. It is the least reef-friendly bottle in my bag, and I no longer take it anywhere I would care about what washes off.
La Roche-Posay Anthelios Pro-Sport SPF 50 (The Sweat-Proof One)
This is the French one, and it’s the best-performing sunscreen I own for a hard, sweaty effort. The Anthelios Pro-Sport SPF 50 goes on invisible, stays put when I’m dripping, and doesn’t sting my eyes. It runs about $33 for 6.7 ounces.
The formula leaves out oxybenzone and octinoxate, so it clears Hawaii’s statewide ban. But it contains octocrylene, which means it would fail the stricter bans in the U.S. Virgin Islands or Palau.
Neutrogena Hydro Boost Water Gel SPF 50 (The Face One)
This is the least expensive bottle of the bunch at around $12, though at 3 ounces it is not the least expensive by volume, and it is the one I reach for on my face and on regular days that don’t involve open water. The Hydro Boost Water Gel SPF 50 sinks in like a moisturizer and leaves zero white cast, which is why it lives in the bathroom rather than the dry bag.
Neutrogena does not market it as reef-safe, and it shouldn’t. It uses the same four chemical filters as the La Roche-Posay, octocrylene included.
What “Reef Safe” Means
There is no legal definition of “reef safe” or “reef friendly.” The FDA does not regulate the term and there’s no agreed test behind it, so a brand can print it on anything. In practice it has come to mean that the product leaves out oxybenzone and octinoxate, the two chemicals named in the laws that started this whole conversation.
NOAA lists about ten chemicals of concern, and the list includes octocrylene and nano-sized mineral particles. A sunscreen can be “reef safe” by the popular definition and still contain something on a scientist’s watch list, as my three chemical bottles do.
A widely cited 2016 lab study by Craig Downs found oxybenzone toxic to coral larvae at very low concentrations. The open question is whether ocean water reaches those levels.
Ecotoxicologists have pushed back on the exposure side. Michael Gonsior at the University of Maryland notes that most of the damage research runs concentrations around a thousand times higher than what turns up in open water, and a 2021 risk assessment in Integrated Environmental Assessment and Management put measured near-shore concentrations two orders of magnitude below the level predicted to cause harm. Several authors of the recent counter-assessments are affiliated with the Personal Care Products Council, the industry trade body. Some crowded coves still test high.
NOAA says how these compounds affect reef ecosystems “remains an active area of research.” I default to reef-safe near sensitive water because it costs me almost nothing.
I paddle freshwater lakes around Sacramento, and there’s no coral in Lake Natoma. For me, reef-safe is mostly a proxy for “fewer questionable chemicals washing off me and into the water.”
Where Sunscreen Chemicals Are Banned
Several places have written the chemistry into law, and the lists are not identical.
- Palau went first, effective January 1, 2020. The statute named ten chemicals, but the regulations that implement it ban whole classes of chemistry: every benzophenone, every cinnamate, every salicylate, every PABA derivative, avobenzone, octocrylene, 4-MBC, and the triazine filters including the newly approved bemotrizinol. No mineral filter is on the list. In practice, mineral is what you can legally bring in. Fines run to $10,000.
- U.S. Virgin Islands banned the “toxic three Os,” adding octocrylene to oxybenzone and octinoxate, effective March 30, 2020.
- Hawaii passed Senate Bill 2571, which became Act 104, banning the sale of sunscreen containing oxybenzone and octinoxate without a prescription, effective January 1, 2021. The ban covers Oʻahu, where I went shark diving off the North Shore in August 2026.
- Maui County, Hawaii went much further than the state. Ordinance 5306, effective October 1, 2022, bans the sale, distribution and use of every non-mineral sunscreen. Only non-nanotized zinc oxide and titanium dioxide are permitted, with fines up to $1,000. Three of my four bottles are illegal there.
- Key West, Florida voted a ban on the same two chemicals in 2019, but it never took effect. Florida SB 172 preempted all local regulation of over-the-counter drugs and cosmetics effective July 1, 2020, six months before the Key West ordinance was due to start. There is no sunscreen ban in the Florida Keys today.
- Thailand bans oxybenzone, octinoxate, 4-methylbenzylidene camphor and butylparaben in all national marine parks, gazetted August 3, 2021, with fines up to 100,000 baht.
- Mexico has no national ban, but Cozumel, the Riviera Maya cenotes and the eco-parks require biodegradable or reef-compliant sunscreen to get in the water. Chemical bottles get confiscated at the gate routinely.
- Aruba banned oxybenzone in 2020, and Bonaire followed in 2021. I could not find the primary legal text for either, so treat the specifics as less firm than the rest of this list.
Octocrylene is the swing chemical. Three of my four sunscreens contain it, which is why they pass Hawaii but would fail in the Virgin Islands or Palau. Maui County is the strictest jurisdiction in the country, because any sunscreen that is not mineral is illegal there.
Mineral vs Chemical Sunscreen
Mineral sunscreens use zinc oxide or titanium dioxide. The old explanation was that they sit on top of your skin and bounce UV away like a mirror. The American Academy of Dermatology has since corrected that: mineral filters both scatter and absorb UV. The white cast is the visible cost, and it doubles as a handy reminder to reapply when it fades.
Chemical sunscreens use filters like avobenzone, homosalate, octisalate, and octocrylene that absorb UV and convert it to heat. They tend to be lighter, clearer, and easier to wear, which is why I bought three. There’s no solid evidence that one category protects better than the other. Both work when you apply enough and reapply often. For me, the choice comes down to feel on the skin and what gets left in the water.
Why People Buy Australian and European Sunscreen
The FDA hadn’t added a new filter to the over-the-counter monograph since 1999, leaving American shelves with 16 approved actives, two of which the FDA has since proposed pulling, while Europe and Australia had more than 30. Several of the best modern UVA filters, including bisoctrizole (Tinosorb M) and Mexoryl 400, still aren’t legal here.
Ecamsule (Mexoryl SX) is the partial exception. The FDA approved it back in July 2006, but as part of one specific La Roche-Posay formula under its own new drug application rather than by adding it to the monograph. It is legal and sold here, but only in L’Oreal-family products.
A peer-reviewed analysis by Environmental Working Group scientists, published in Photodermatology, Photoimmunology and Photomedicine, tested 51 U.S. sunscreens and found they delivered on average 59% of their labeled UVB protection and about 24% of the UVA protection the SPF number implies. EWG is an advocacy organization and the framing is theirs, but the study went through peer review.
UVB is the burning ray and UVA is the aging, deeper-penetrating one, and both feed skin cancer. A formula that’s strong on SPF but weak on UVA leaves a hole where you can’t feel it.
On June 9, 2026, the FDA approved bemotrizinol at concentrations up to 6%, the first new sunscreen filter added to the U.S. monograph in roughly 25 years. It was first filed back in 2005. The order did not take effect until August 9, 2026, which is the first date a manufacturer could legally put it in a bottle, so American formulas containing it should turn up in the 2027 season rather than this one.
How to Use Sunscreen So It Works
SPF 30 blocks roughly 97% of UVB rays, which is why it’s the floor most dermatologists recommend. Going higher adds little, and no sunscreen blocks everything.
Apply about one ounce, a full shot glass, 15 minutes before you head out. Reapply every two hours or right after swimming or heavy sweating.
“Waterproof” is not a legal claim anymore, and neither is “sweatproof” or “sunblock.” The strongest a label can say is water resistant for 80 minutes. There is also a 40-minute tier, which is the more common one on drugstore shelves and easy to misread as the same thing. On a five-hour paddle you are reapplying either way.
Don’t Step Into the Spray
“Don’t step into the spray like you’re spraying perfume,” says Sarah Adams, MD, FAAD, a dermatologist with Kaiser Permanente in Southern California. Her point is that you won’t get the density of sunscreen you need that way, and you won’t get it on evenly. Spray onto skin and rub it in. I skipped the rub-in step before the next photo, taken while kayaking Badwater Basin in Death Valley. The white splotches on my legs are mineral sunscreen I didn’t work in well enough.
Cover the Spots You Forget
Ears, neck, the backs of the hands, and the scalp get missed constantly. The scalp is a common site for skin cancer, which dermatologists including Adams flag repeatedly. With short hair, that one hits home for me every time I feel the burn on top of my head an hour in.
Check the Expiration Date
Sunscreen degrades, and direct sun speeds it up. Store the bottle somewhere cool between trips.
Steven Q. Wang, MD, a board-certified dermatologist and Mohs surgeon who directs dermatologic oncology at the Hoag Family Cancer Institute, and Anisha B. Patel, MD, of the University of Texas MD Anderson Cancer Center, both stress that the best sunscreen is the one you’ll put on and reapply.
How to Remove Mineral Sunscreen
Mineral sunscreen clings, which makes for a stubborn cleanup when you’re trying to keep gear clean.
Baby wipes, hand sanitizer, and plain soap and water all knock it back in a pinch. For a proper job, an oil cleanser or balm breaks it down, then you rinse with water. The Isdin oil cleanser does this well. Follow the oil cleanse with your regular water-based cleanser so your skin isn’t left coated.
Where I Use This Stuff
Most of my sun exposure happens on flatwater. When I’m out for four or five hours on Lake Natoma, I reapply on a schedule rather than by feel, because by the time you feel it, you’re already burned. The same goes for long, shadeless days at Lake Clementine, where there are no lifeguards and not much tree cover.
If you’re newer to the water and figuring out your own kit, sun protection belongs on the list right next to the board and the leash. I keep it in the same packing rhythm I use for a first paddle board race, and it’s a standing item in everything I write about paddleboarding.
Frequently Asked Questions
What does reef-safe sunscreen mean?
It’s an unregulated marketing term. The FDA does not define or test it. In common use it means the product leaves out oxybenzone and octinoxate, the two chemicals named in the first sunscreen bans. It does not guarantee the product is free of every chemical scientists worry about, and it does not tell you whether the bottle is legal where you are going. Maui County requires mineral only; Palau bans most chemical filter classes outright.
Is Neutrogena sunscreen reef safe?
The Neutrogena Hydro Boost Water Gel I use is not marketed as reef-safe, and it shouldn’t be. It uses avobenzone, homosalate, octisalate, and octocrylene. It’s a solid everyday sunscreen for your face, but it’s the wrong choice for sensitive water.
Which is better, mineral or chemical sunscreen?
Neither is clearly better at protecting your skin. Mineral is the safer bet for reefs and sensitive skin but can leave a white cast. Chemical formulas feel lighter and disappear faster. The best one is whichever you’ll apply often enough.
What SPF should I use?
SPF 30 blocks about 97% of UVB and is the floor most dermatologists recommend for extended time outside. Higher SPF adds only a little more protection, and none reaches 100%. For all-day water activities, a broad-spectrum, water-resistant SPF 30 to 50 is the right range.
Is spray sunscreen as good as lotion?
It can be, but only if you use it correctly. Don’t stand in the mist. Spray it straight onto your skin and rub it in so the coverage is even. Sprays make reapplication fast on the water, which is their advantage.
Does sunscreen in a moisturizer count?
SPF in a moisturizer can be as effective as a standalone sunscreen, but moisturizer rarely goes on thickly enough to hit the rated protection. For a day on the water, use a dedicated sunscreen. The moisturizer is better than nothing on an ordinary day.
How often do I need to reapply?
Every two hours, and immediately after swimming or heavy sweating. No sunscreen is waterproof. Labels come in two tiers, 40 minutes and 80 minutes, and 80 is the strongest claim allowed, so on a long paddle you’ll reapply several times regardless of what the bottle says.
Which sunscreen is legal in Hawaii and Maui?
They are two different rules. Hawaii’s statewide Act 104 bans the sale of sunscreen containing oxybenzone or octinoxate without a prescription. Maui County goes much further: Ordinance 5306 has banned the sale, distribution and use of every non-mineral sunscreen since October 1, 2022, permitting only non-nanotized zinc oxide and titanium dioxide, with fines to $1,000. A bottle that clears the state rule can still be illegal on Maui.
Is Australian sunscreen better than American sunscreen?
In some ways. Australia and Europe approve more UV filters than the U.S. does, and several are stronger on UVA. The Australian bottle in my own rotation, Cancer Council Kids SPF50+, contains 4-methylbenzylidene camphor, which the European Union prohibited in cosmetics as of May 2026 over endocrine-disruption evidence, and which Palau and Thailand’s marine parks both ban. Two of its four filters are not FDA-approved at all.
When should I see a dermatologist about sun damage?
Skin changes over time even with good habits, but new growths, bleeding, scabbing, or itching are worth a visit. Regular skin checks make sense if you have many moles, a personal or family history of skin cancer, fair skin, light eyes, or red hair. Everyone, regardless of skin tone, benefits from protection.
Affiliate Disclosure: Some links in this article are affiliate links, which means I may earn a small commission if you buy through them, at no extra cost to you. I only link to products I bought and use.
Article Updates
- October 10, 2026: Edited for clarity.
- August 6, 2026: Fact-check pass with corrections. Read the Cancer Council Kids label at last and published its filters: 4-methylbenzylidene camphor 4%, octocrylene 4%, ethylhexyl triazone 3%, avobenzone 3%. Two of those are not FDA-approved actives, and 4-MBC is on NOAA’s list of ten compounds of concern, banned in Palau and in Thailand’s national marine parks, and prohibited in EU cosmetics under Commission Regulation (EU) 2024/996 since May 1, 2026. That bottle is now described as the least reef-friendly one I carry. Corrected the Key West entry: that ban never took effect, because Florida SB 172 preempted all local over-the-counter drug regulation effective July 1, 2020, six months before the ordinance was due to start. Added Maui County Ordinance 5306, which since October 1, 2022 has banned every non-mineral sunscreen and permits only non-nanotized minerals; it is the strictest jurisdiction in the country and it was missing entirely. Added Thailand’s marine-park ban and Mexico’s park-level requirements. Rewrote the Palau entry, whose regulations ban whole classes of chemistry rather than the ten chemicals the statute named. Corrected the claim that ecamsule (Mexoryl SX) is not legal in the U.S.; the FDA approved it in 2006 under a new drug application rather than through the monograph. Corrected the filter count from “around 17” to 16, and the “no new filter since the late 1990s” line to specify the monograph. Added the August 9, 2026 effective date for bemotrizinol. Downgraded “only the mineral one is truly reef-safe” to a claim about clearing bans, and disclosed that Sun Bum does not state whether its minerals are non-nano, which NOAA flags and Maui County requires. Attributed the 24% UVA figure to the peer-reviewed EWG study, named Craig Downs on the 2016 coral research, added the exposure-side counter-evidence along with its industry affiliations, defined “broad spectrum” as a pass/fail test, and added the 40-minute water-resistance tier. Replaced a paraphrase presented as a direct quotation from Dr. Sarah Adams with her actual published wording, and removed two quotations that could not be sourced to her. Replaced a shortened affiliate link with the canonical form. Corrected the alt text on the Sun Bum photo, which described the bottle as the SPF 50 when the bottle in the picture is the SPF 30, and captioned it accordingly.
- June 14, 2026: Expanded the article from a single mineral spray pick into a full reef-safe rotation review. Added my four tested sunscreens with honest reef labeling, a comparison table, the breakdown of where sunscreen chemicals are banned, the mineral versus chemical explainer, and the U.S. filter-lag section noting the FDA’s June 9, 2026 approval of bemotrizinol. Corrected application guidance to 15 minutes before sun and clarified the 80-minute water-resistance claim.
