seafoam marine
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.2%return rate — above 5% kills the launch gate
Growth
Incredible+176.8%90-day search growth — must beat 0% to launch
Avg price
Incredible$38.64avg listing price — sweet spot $15–$100
Conversion
Great7.5%search→purchase rate — share of searches ending in a sale
Price range
Good$11.14–$136.38cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Okay2,370.75avg incumbent reviews — the moat a new listing must climb
Market size
Bad$95K$95K/yr · 33K searches
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
Competition
Bad91%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, seafoam marine is a $95K/yr Amazon United States market (33K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 48/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
seafoam marine market data
- Units sold / yr
- 3K–4K
- avg 250–500/product
- Revenue / yr
- $116K–$155K
- units × avg price
- Conversion rate
- 7.5%
- Avg BSR
- #63
- Page quality
- 0%
- Prime
- 25%
- Sponsored
- 63%
- Out of stock
- 0.0%
- Avg brand age
- 74 months
- Avg seller age
- 164 days
Competition & brand share
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.Brands
4 rising
Sellers
86
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
91%
Top 20: 100%
Open market
0%
- Sea Foam46%
- STA-BIL39%
- KITLEY12%
- Generic3%
- Open — no brand owns it (0%)
Demand
Weekly Amazon search volume, last 13 weeks — +176.8% search growth over the last 90 days.Top seafoam marine search terms
- sea foam marine pro8K/yr
- seafoam marine pro5K/yr
- seafoam marine7K/yr
- seafoam marine pro fuel treatment6K/yr
- sea foam marine3K/yr
- marine seafoam3K/yr
Top seafoam marine products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 8 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3
Sea Foam$39.334.8★1,003 rev
STA-BIL 360 Marine Fuel System Treatment 32 oz
STA-BIL$22.254.8★8,043 rev
KITLEY Marine PRO Marine Fuel System Treatment MP20
KITLEY$21.045.0★3 rev
STA-BIL Marine Tune-Up Fuel Treatment Cleans Carburetors and Injectors Fixes Rough Running Engines Eliminates Water Treats up to 20 Gallons 8 oz. (22313) Blue 8oz
STA-BIL$11.144.7★490 rev
Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 1
Sea Foam$14.534.8★1,003 rev
Newest
by launch dateKITLEY Marine PRO Marine Fuel System Treatment MP20
KITLEY$21.043 rev
Marine Fuel System Treatment 2 Bottles (40 oz / 1.18 L Total) | Fuel Stabilizer & Cleaner for Boats Outboards & PWCs | Helps Restore Power & Improve Efficiency
Generic$34.363 rev
Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3
Sea Foam$39.331,003 rev
STA-BIL Marine Tune-Up Fuel Treatment Cleans Carburetors and Injectors Fixes Rough Running Engines Eliminates Water Treats up to 20 Gallons 8 oz. (22313) Blue 8oz
STA-BIL$11.14490 rev
MP20 20OZ Seafoam Marine Pro - Quantity 12
Sea Foam$136.3851 rev
Trending
90-day click momentumKITLEY Marine PRO Marine Fuel System Treatment MP20
KITLEY$21.045.0★
Marine Fuel System Treatment 2 Bottles (40 oz / 1.18 L Total) | Fuel Stabilizer & Cleaner for Boats Outboards & PWCs | Helps Restore Power & Improve Efficiency
Generic$34.365.0★
STA-BIL 360 Marine Fuel System Treatment 32 oz
STA-BIL$22.254.8★
Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3
Sea Foam$39.334.8★
STA-BIL Marine Tune-Up Fuel Treatment Cleans Carburetors and Injectors Fixes Rough Running Engines Eliminates Water Treats up to 20 Gallons 8 oz. (22313) Blue 8oz
STA-BIL$11.144.7★
What buyers say about seafoam marine
What buyers praise and complain about, mined from review topics.What buyers love
“Great product help clean my boat motor from fuel lines to carbs even inside where the cylinders are”
“Significant improvement”
“competitive price”
“helps turn on cranky motors”
“Worked well”
“Clean motor”
“Works as advertised”
“Its a great product for keeping your carburetors and injectors, clean and your vehicles or mowers”
“Bottle is perfect for measuring out the right amount”
“So I had a Polaris Outlaw 110 EFI, when started cold it kept shutting off and ran rough, mixed a can of this 50/50 with gas and ran it through and now it purrs like a kitten, definitely works”
What buyers complain about
“Failed to clean out gas in my carburetor”
“Had water in my gas”
“Failed to clean out gas in my carburetor”
Top return reasons
Common questions
- Is seafoam marine profitable to sell on Amazon United States?
- The niche generates $95K/yr across 8 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +176.8%. Flapen's verdict: Skip it (48/100).
- How competitive is the seafoam marine niche?
- 4 brands and 86 sellers compete. The top 5 products take 91% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in seafoam marine?
- Top complaints mined from reviews: Fuel Efficiency, Water Resistance, Ease Of Cleaning. The return rate is 0.2%.
- What does it cost to enter the seafoam marine niche?
- Listings span $11.14–$136.38; the average listing price is $38.64 (sweet spot $15–$100). The average incumbent carries 2,371 reviews — the moat a new listing must climb.