---
title: "Marine 31 — $31K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/sports-outdoors/marine-31"
last_updated: "2026-08-12T15:46:34.266Z"
locale: en
meta:
description: "Amazon product research for marine 31: $31K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for marine 31: $31K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Marine 31 — $31K/mo Amazon US Product Research (2026)"
---
# **Marine 31**
**Worth a look**
Shows searches that convert (17.6% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 54Growth 96Conversion 99Competition 13Returns 99Price range 95Avg price 95Brand share 0Review moat 75Quality gap 28
**Conversion**
**Incredible****17.6%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Growth**
**Incredible****+165.3%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$37.72**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$21.77–$59.85**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****508.56**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$376K**
$376K/yr · 57K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****84%**
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)")
## **Is marine 31 profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, marine 31 is a $376K/yr Amazon United States market (57K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Worth a look — 60/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **marine 31 market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **10K–13K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **$377K–$472K**
- units × avg price
- **Conversion rate**
- **17.6%**
- **Avg BSR**
- **#260**
- **Page quality**
- **0%**
- **Prime**
- **89%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **89 months**
- **Avg seller age**
- **172 days**
## **Competition: brands, sellers & click share**
The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**1 **—flat
**Sellers**
**2**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**84%**
Top 20: 100%
**Open market**
**0%**
- Marine 31100%
## **marine 31 demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +165.3% search growth over the last 90 days.
3K2KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 6.8×
[**Open Trend **](https://flapen.com/research/us/sports-outdoors/marine-31/trend)
## **Top marine 31 search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **marine 31**27K/yr+152.7%14.4% conv. - **marine 31 mold and mildew remover for boats**20K/yr+161.6%18.6% conv. - **marine 31 mildew stain remover**7K/yr+237.7%16.3% conv. - **marine 31 vinyl cleaner**2K/yr+144.0%15.1% conv. [**All search terms **](https://flapen.com/research/us/sports-outdoors/marine-31/search-terms)
## **Top marine 31 products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%15%$56K30%$113K45%$169K60%$226K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz**Marine 31**$21.97**4.6★1,207 rev](https://www.amazon.com/dp/B0B9DCX1ZJ) [2**Marine 31 Mildew Stain Remover & Cleaner | Powerful Cleaning Solution for Boats Homes & Patios | Removes Stubborn Stains from Showers Vinyl & Fiberglass | Easy to Use | M31-372-128OZ | 128oz Gallon**Marine 31**$49.37**4.6★854 rev](https://www.amazon.com/dp/B09J93FLGT) [3**Marine 31 Mildew Stain Remover & Cleaner Gel Combo - Marine & Boat Home & Patio Bathroom & Shower Cleaner (20oz. Spray Bottle & 128oz. Gallon Bundle)**Marine 31**$59.43**4.6★497 rev](https://www.amazon.com/dp/B07W8VYTT7) [4**Marine 31 Vinyl Protectant with Sunblock | Prevents Fading & Cracking | Safe for Boats Car Interiors & Patio Furniture | Long-Lasting UV Protection | M31-430 | 20 oz**Marine 31**$23.86**4.7★402 rev](https://www.amazon.com/dp/B00EUI41V2) [5**Marine 31 Vinyl Cleaner & Conditioner | Cleans Protects & Prevents UV Damage | Safe for Boats Car Interiors & Patio Furniture | No Sticky Residue Long-Lasting Protection | M31-401 | 32 oz**Marine 31**$29.88**4.6★165 rev](https://www.amazon.com/dp/B00EYN8952)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Marine 31 Mildew Stain Remover & Cleaner | Eliminates Stains from Marine Boat Home & Patio Surfaces | Cleans Bathrooms Showers & More | M31-371 | 32oz**Marine 31**$34.70**343 rev4y ago](https://www.amazon.com/dp/B09KY8Y4YT) [**Marine 31 Mildew Stain Remover & Cleaner | Powerful Cleaning Solution for Boats Homes & Patios | Removes Stubborn Stains from Showers Vinyl & Fiberglass | Easy to Use | M31-372-128OZ | 128oz Gallon**Marine 31**$49.37**854 rev4y ago](https://www.amazon.com/dp/B09J93FLGT) [**Marine 31 Mildew Stain Remover & Cleaner | Removes Stains from Boats Homes Patios Bathrooms & Showers | Effective Mold & Mildew Cleaner | M31-370X2 | 20oz (2-Pack)**Marine 31**$38.60**717 rev4y ago](https://www.amazon.com/dp/B07HCP3QRT) [**Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz**Marine 31**$21.97**1,207 rev4y ago](https://www.amazon.com/dp/B0B9DCX1ZJ) [**Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Homes Patios Bathrooms & Showers | Removes Mold & Mildew Stains | Combo Pack | M31-370-RFK-1 | 20oz & Gallon**Marine 31**$59.85**112 rev4y ago](https://www.amazon.com/dp/B09YJXKSS1)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Marine 31 Mildew Stain Remover & Cleaner Gel Combo - Marine & Boat Home & Patio Bathroom & Shower Cleaner (20oz. Spray Bottle & 128oz. Gallon Bundle)**Marine 31**$59.43**4.6★**▲ 49%**](https://www.amazon.com/dp/B07W8VYTT7) [**Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Homes Patios Bathrooms & Showers | Removes Mold & Mildew Stains | Combo Pack | M31-370-RFK-1 | 20oz & Gallon**Marine 31**$59.85**4.6★**▲ 35%**](https://www.amazon.com/dp/B09YJXKSS1) [**Marine 31 Vinyl Protectant with Sunblock | Prevents Fading & Cracking | Safe for Boats Car Interiors & Patio Furniture | Long-Lasting UV Protection | M31-430 | 20 oz**Marine 31**$23.86**4.7★**▲ 19%**](https://www.amazon.com/dp/B00EUI41V2) [**Marine 31 Mildew Stain Remover & Cleaner | Removes Stains from Boats Homes Patios Bathrooms & Showers | Effective Mold & Mildew Cleaner | M31-370X2 | 20oz (2-Pack)**Marine 31**$38.60**4.6★**▲ 18%**](https://www.amazon.com/dp/B07HCP3QRT) [**Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz**Marine 31**$21.97**4.6★**— 2%**](https://www.amazon.com/dp/B0B9DCX1ZJ)
**~~View all trending →~~**
## **What reviews say buyers love and hate about marine 31**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“Excellent product”*
**Ease Of Cleaning**21%
*“Best cleaner EVER”*
**Efficiency**14%
*“Effective”*
**Product Condition**9%
*“Like new”*
**Ease Of Use**8%
*“EASY TO USE”*
**Advertised Vs Actual Product**7%
*“Just as Advertised”*
**Value For Money**4%
*“price is good”*
**Material Quality**3%
*“Make vinyl Look New and Soft”*
**Brightness/Shine/Glow**2%
*“Brightness”*
**Smell**1%
*“no more mildew smells”*
### **What buyers complain about **
**Smell**20%
*“another product that smell like clorox which is a lot cheaper than this product”*
**Functionality-Overall**14%
*“Doesn't work”*
**Stain Resistance**14%
*“Soap and water did nothing to these stains”*
**Value For Money**8%
*“Waste of money”*
**Advertised Vs Actual Product**7%
*“Shame on them for deceiving everyone”*
**Ease Of Cleaning**7%
*“Lots of scrubbing no real change”*
**Leak-Proof**5%
*“leaked”*
**Color**5%
*“it changed colors”*
**Material Quality**4%
*“the vinyl was eaten away”*
**Paint Quality**2%
*“But- it didn't take paint off the seats”*
### **Top return reasons **
**Leak-Proof**43%
**Advertised Vs Actual Product**17%
**Defective Material/Parts**11%
**Stain Resistance**7%
**Spray/Flow**7%
**Ease Of Cleaning**4%
**Material Quality**4%
**Wet Cleaning**4%
**Functionality-Overall**2%
## **Common marine 31 questions**
- **Is marine 31 profitable to sell on Amazon United States?**
- The niche generates $376K/yr across 9 tracked products. 90-day search growth is +165.3%. Flapen's verdict: Worth a look (60/100).
- **How competitive is the marine 31 niche?**
- 1 brands and 2 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in marine 31?**
- Top complaints mined from reviews: Smell, Functionality-Overall, Stain Resistance. The return rate is 0.2%.
- **When does demand for marine 31 peak?**
- Demand peaks in May–Jun–Jul–Aug; the busiest month runs 6.8× the quietest.
- **What does it cost to enter the marine 31 niche?**
- Listings span $21.77–$59.85; the average listing price is $37.72 (sweet spot $15–$100). The average incumbent carries 509 reviews — the moat a new listing must climb.
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