Is flex seal black profitable to sell on Amazon United States?

The niche generates $80K/yr across 16 tracked products. 90-day search growth is +63.6%. Flapen's verdict: Worth a look (54/100).

How competitive is the flex seal black niche?

7 brands and 112 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 97% of demand.

What do buyers complain about in flex seal black?

Top complaints mined from reviews: Functionality-Overall, Leak-Proof, Value For Money. The return rate is 0.2%.

When does demand for flex seal black peak?

Demand peaks in May–Sep; the busiest month runs 18.1× the quietest.

What does it cost to enter the flex seal black niche?

Listings span $6.20–$108.32; the average listing price is $26.88 (sweet spot $15–$100). The average incumbent carries 12,405 reviews — the moat a new listing must climb.

flex seal black

Worth a look

Shows low returns (0.2%), but brand-locked demand (top 5 brands take 97% of clicks) keeps it on the watch list.

Returns

Incredible0.2%

return rate — above 5% kills the launch gate

Avg price

Incredible$26.88

avg listing price — sweet spot $15–$100

Conversion

Great9.4%

search→purchase rate — share of searches ending in a sale

Price range

Great$6.20–$108.32

cheapest to priciest tracked listing — scored on the share inside $15–$100

Growth

Great+63.6%

90-day search growth — must beat 0% to launch

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Competition

Okay68%

top-5 click share — leaders hold, buyers still browse

Market size

Bad$80K

$80K/yr · 32K searches

Review moat

Bad12,404.88

avg incumbent reviews — the moat a new listing must climb

Brand share

Bad97%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, flex seal black is a $80K/yr Amazon United States market (32K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in May–Sep. Verdict: Worth a look — 54/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

flex seal black market data

Units sold / yr: 4K–5K; avg 100–250/product
Revenue / yr: $108K–$134K; units × avg price
Conversion rate: 9.4%
Avg BSR: #44
Page quality: 0%
Prime: 94%
Sponsored: 63%
Out of stock: 0.0%
Avg brand age: 63 months
Avg seller age: 153 days

Competition & brand share

The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.

Brands

7 falling

Sellers

112

Top-5 brand share

97%

Top 20: 100%

Top-5 click share

68%

Top 20: 100%

Open market

Flex Seal70%
Flex Seal Liquid18%
Flex Shot3%
Leak Stopper3%
GORILLA2%
Flex Paste2%
Open — no brand owns it (1 brand, 1%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +63.6% search growth over the last 90 days.

Peak months: May, Sep · busiest ÷ quietest = 18.1×

Open Trend

Top flex seal black search terms

flex seal black13K/yr +55.4%7.8% conv.
black flex seal7K/yr +54.8%8.6% conv.
flex seal spray black7K/yr +54.1%10.2% conv.
flex seal black spray2K/yr +112.9%14.2% conv.
black flex seal spray2K/yr +126.0%12.1% conv.

All search terms

Top flex seal black 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Flex Seal 14 oz Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$14.344.4★39,391 rev

Flex Seal MAX 17 oz 2-Pack Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$33.044.4★39,391 rev

Flex Seal Liquid Rubber Coating Sealant Waterproof Flexible Breathable and UV Resistant Roof Repair Basements RV Campers Trailers Marine EPDM Masonry Black 16 oz

Flex Seal Liquid$18.294.5★2,242 rev

Flex Seal Mini Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Travel Size Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$6.374.1★288 rev

Flex Seal 14 oz 2-Pack Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$28.234.4★39,391 rev

Newest

by launch date

Flex Seal Epoxy Extreme Liquid Multi-Purpose Durable Permanent Watertight Long-Lasting Bond for Automotive Marine Plumbing Home & Tool Repairs Cures Black 0.85 oz (25 mL) Syringe

Flex Seal$9.70239 rev

1y ago

Flex Caulk Waterproof & Weatherproof Hybrid Polymer Sealant Strong Paintable Indoor Outdoor Bath Shower Sink Window Baseboards Door RV Roof Wood Auto & Marine Clear 6.6 oz 1-Pack

Flex Seal$19.511,943 rev

2y ago

Flex Seal MAX 17 oz 2-Pack Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$33.0439,391 rev

3y ago

Flex Seal Spray Rubber Sealant Coating 14-oz Black (6 Pack)

Flex Seal$78.7653 rev

4y ago

Flex Seal MAX 17 oz 1-Pack Black Stop Leaks Instantly Waterproof Rubber Spray On Sealant Coating Perfect for Gutters Wood RV Campers Roof Repair Skylights Windows and More

Flex Seal$16.7139,391 rev

5y ago

What buyers say about flex seal black

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall22%

“Quality Sealant”

Advertised Vs Actual Product10%

“As advertised”

Ease Of Use10%

“practical for everyday use”

Efficiency9%

“Worked great - So Far”

Adhesion/Stickiness8%

“This is a good adhesive product has lasted a long time so far”

Water Resistance6%

“Great for waterproofing wood”

Leak-Proof6%

“it stopped the leaks”

Durability4%

“Strong / durable”

Locking Mechanism3%

“Flex seal”

Maintenance And Repair2%

“Good temporary fix”

What buyers complain about

Functionality-Overall13%

“Didn't work properly”

Leak-Proof12%

“It was a pretty significant leak”

Value For Money8%

“A little expensive”

Adhesion/Stickiness7%

“Glue is only as good as the container it comes in”

Size-Overall5%

“Small”

Quality-Overall5%

“lousy quality control”

Water Resistance5%

“water would get in”

Ease Of Use5%

“hard to use”

Spray/Flow4%

“wont spray”

Color4%

“Turns yellow after a while :”

Top return reasons

Color23%

Adhesion/Stickiness21%

Hard Feel16%

Advertised Vs Actual Product8%

Functionality-Overall7%

Size-Overall4%

Defective Material/Parts3%

Value For Money3%

Ease Of Use2%

Product Condition2%

Common questions

Is flex seal black profitable to sell on Amazon United States?: The niche generates $80K/yr across 16 tracked products. 90-day search growth is +63.6%. Flapen's verdict: Worth a look (54/100).
How competitive is the flex seal black niche?: 7 brands and 112 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 97% of demand.
What do buyers complain about in flex seal black?: Top complaints mined from reviews: Functionality-Overall, Leak-Proof, Value For Money. The return rate is 0.2%.
When does demand for flex seal black peak?: Demand peaks in May–Sep; the busiest month runs 18.1× the quietest.
What does it cost to enter the flex seal black niche?: Listings span $6.20–$108.32; the average listing price is $26.88 (sweet spot $15–$100). The average incumbent carries 12,405 reviews — the moat a new listing must climb.