---
title: "Seafoam Marine — $95K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/seafoam-marine"
last_updated: "2026-08-09T18:42:48.403Z"
locale: en
meta:
description: "Niche score 48/100 · $95K/yr market · 33K searches/yr · $38.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $95K/yr market · 33K searches/yr · $38.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Seafoam Marine — $95K/yr Amazon US Niche (2026) - Flapen"
---
# **seafoam marine**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 24Growth 97Conversion 77Competition 7Returns 99Price range 68Avg price 95Brand share 0Review moat 41Quality gap 11
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Growth**
**Incredible****+176.8%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$38.64**
avg listing price — sweet spot $15–$100
**Conversion**
**Great****7.5%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$11.14–$136.38**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,370.75**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Bad****$95K**
$95K/yr · 33K searches
**Quality gap**
**Bad****4.8★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****91%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)")
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 ~~](https://flapen.com/research/methodology)
## **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.
1K750Spike '26Apr '26Apr '26May '26May '26Jun '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/automotive/seafoam-marine/trend)
## **Top seafoam marine search terms**
- **sea foam marine pro**8K/yr+336.7%10.0% conv. - **seafoam marine pro**5K/yr+214.8%7.1% conv. - **seafoam marine**7K/yr+139.6%7.2% conv. - **seafoam marine pro fuel treatment**6K/yr+107.7%9.6% conv. - **sea foam marine**3K/yr+90.5%6.1% conv. - **marine seafoam**3K/yr+108.3%6.8% conv. [**All search terms **](https://flapen.com/research/us/automotive/seafoam-marine/search-terms)
## **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.
0%10%$10K20%$19K30%$29K40%$38K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 8 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3**Sea Foam**$39.33**4.8★1,003 rev](https://www.amazon.com/dp/B0FL9Z518N) [2**STA-BIL 360 Marine Fuel System Treatment 32 oz**STA-BIL**$22.25**4.8★8,043 rev](https://www.amazon.com/dp/B001CAW2DK) [3**KITLEY Marine PRO Marine Fuel System Treatment MP20**KITLEY**$21.04**5.0★3 rev](https://www.amazon.com/dp/B0G2YD423Y) [4**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**$11.14**4.7★490 rev](https://www.amazon.com/dp/B00NEG3SQ0) [5**Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 1**Sea Foam**$14.53**4.8★1,003 rev](https://www.amazon.com/dp/B071LLP5VB)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KITLEY Marine PRO Marine Fuel System Treatment MP20**KITLEY**$21.04**3 rev7mo ago](https://www.amazon.com/dp/B0G2YD423Y) [**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**$34.36**3 rev9mo ago](https://www.amazon.com/dp/B0FVNTHXWR) [**Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3**Sea Foam**$39.33**1,003 rev11mo ago](https://www.amazon.com/dp/B0FL9Z518N) [**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**$11.14**490 rev4y ago](https://www.amazon.com/dp/B00NEG3SQ0) [**MP20 20OZ Seafoam Marine Pro - Quantity 12**Sea Foam**$136.38**51 rev5y ago](https://www.amazon.com/dp/B08DRVHNFG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**KITLEY Marine PRO Marine Fuel System Treatment MP20**KITLEY**$21.04**5.0★**▲ 108%**](https://www.amazon.com/dp/B0G2YD423Y) [**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**$34.36**5.0★**▲ 99%**](https://www.amazon.com/dp/B0FVNTHXWR) [**STA-BIL 360 Marine Fuel System Treatment 32 oz**STA-BIL**$22.25**4.8★**▲ 72%**](https://www.amazon.com/dp/B001CAW2DK) [**Sea Foam Marine PRO Marine Fuel System Treatment MP20 20 oz Pack of 3**Sea Foam**$39.33**4.8★**— 2%**](https://www.amazon.com/dp/B0FL9Z518N) [**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**$11.14**4.7★**— 2%**](https://www.amazon.com/dp/B00NEG3SQ0)
**~~View all trending →~~**
## **What buyers say about seafoam marine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Fuel Efficiency**18%
*“Great product help clean my boat motor from fuel lines to carbs even inside where the cylinders are”*
**Quality-Overall**16%
*“Significant improvement”*
**Value For Money**14%
*“competitive price”*
**Motor Power**10%
*“helps turn on cranky motors”*
**Efficiency**10%
*“Worked well”*
**Ease Of Cleaning**8%
*“Clean motor”*
**Advertised Vs Actual Product**5%
*“Works as advertised”*
**Lubrication**5%
*“Its a great product for keeping your carburetors and injectors, clean and your vehicles or mowers”*
**Measurement/Reading Accuracy**3%
*“Bottle is perfect for measuring out the right amount”*
**Coolant**3%
*“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 **
**Fuel Efficiency**50%
*“Failed to clean out gas in my carburetor”*
**Water Resistance**33%
*“Had water in my gas”*
**Ease Of Cleaning**17%
*“Failed to clean out gas in my carburetor”*
### **Top return reasons **
**Value For Money**36%
**Leak-Proof**36%
**Size-Overall**18%
**Functionality-Overall**7%
**Advertised Vs Actual Product**4%
## **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.
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