Marine 31
Worth a lookShows searches that convert (17.6% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Incredible17.6%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.2%return rate — above 5% kills the launch gate
Growth
Incredible+165.3%90-day search growth — must beat 0% to launch
Avg price
Incredible$37.72avg listing price — sweet spot $15–$100
Price range
Incredible$21.77–$59.85cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good508.56avg incumbent reviews — the moat a new listing must climb
Market size
Good$376K$376K/yr · 57K searches
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Competition
Bad84%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
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
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.Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 6.8×
Top marine 31 search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.- marine 3127K/yr
- marine 31 mold and mildew remover for boats20K/yr
- marine 31 mildew stain remover7K/yr
- marine 31 vinyl cleaner2K/yr
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.
All 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz
Marine 31$21.974.6★1,207 rev
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$49.374.6★854 rev
Marine 31 Mildew Stain Remover & Cleaner Gel Combo - Marine & Boat Home & Patio Bathroom & Shower Cleaner (20oz. Spray Bottle & 128oz. Gallon Bundle)
Marine 31$59.434.6★497 rev
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$23.864.7★402 rev
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$29.884.6★165 rev
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$34.70343 rev
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$49.37854 rev
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$38.60717 rev
Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz
Marine 31$21.971,207 rev
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$59.85112 rev
Trending
90-day click momentumMarine 31 Mildew Stain Remover & Cleaner Gel Combo - Marine & Boat Home & Patio Bathroom & Shower Cleaner (20oz. Spray Bottle & 128oz. Gallon Bundle)
Marine 31$59.434.6★
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$59.854.6★
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$23.864.7★
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$38.604.6★
Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats Home Patio & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz
Marine 31$21.974.6★
What reviews say buyers love and hate about marine 31
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Best cleaner EVER”
“Effective”
“Like new”
“EASY TO USE”
“Just as Advertised”
“price is good”
“Make vinyl Look New and Soft”
“Brightness”
“no more mildew smells”
What buyers complain about
“another product that smell like clorox which is a lot cheaper than this product”
“Doesn't work”
“Soap and water did nothing to these stains”
“Waste of money”
“Shame on them for deceiving everyone”
“Lots of scrubbing no real change”
“leaked”
“it changed colors”
“the vinyl was eaten away”
“But- it didn't take paint off the seats”
Top return reasons
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.