Is flex glue profitable to sell on Amazon United States?

The niche generates $141K/yr across 22 tracked products. 5 of 6 products launched in the last 360 days are still selling. 90-day search growth is +96.7%. Flapen's verdict: Worth a look (64/100).

How competitive is the flex glue niche?

15 brands and 128 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 74% of demand.

What do buyers complain about in flex glue?

Top complaints mined from reviews: Leak-Proof, Adhesion/Stickiness, Functionality-Overall. The return rate is 1.1%.

When does demand for flex glue peak?

Demand peaks in Jun–Jul; the busiest month runs 2.7× the quietest.

What does it cost to enter the flex glue niche?

Listings span $6.30–$68.37; the average listing price is $21.43 (sweet spot $15–$100). The average incumbent carries 2,099 reviews — the moat a new listing must climb.

flex glue

Worth a look

Shows low returns (1.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Great1.1%

return rate — above 5% kills the launch gate

Avg price

Great$21.43

avg listing price — sweet spot $15–$100

Growth

Great+96.7%

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

Price range

Great$6.30–$68.37

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

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good5.5%

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

Brand share

Good74%

top-5 brand share — brands hold most of the demand

Competition

Okay57%

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

Review moat

Okay2,099.23

avg incumbent reviews — the moat a new listing must climb

Market size

Okay$141K

$141K/yr · 121K searches

According to Flapen's Amazon United States niche tracking, flex glue is a $141K/yr Amazon United States market (121K searches/yr). The top 5 brands hold 74% of demand. Demand peaks in Jun–Jul. Verdict: Worth a look — 64/100.

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

flex glue market data

Units sold / yr: 10K–13K; avg 500–750/product
Revenue / yr: $214K–$268K; units × avg price
Conversion rate: 5.5%
Avg BSR: #66
Page quality: 0%
Prime: 100%
Sponsored: 73%
Out of stock: 0.0%
Avg brand age: 71 months
Avg seller age: 151 days

Competition & brand share

The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 rising

Sellers

128

Top-5 brand share

74%

Top 20: 100%

Top-5 click share

57%

Top 20: 97%

Open market

20%

FLEX GLUE43%
Berkland11%
J-B Weld8%
Epoxybond Pool Putty6%
Flex Seal6%
Underwater Magic6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +96.7% search growth over the last 90 days.

Peak months: Jun, Jul · busiest ÷ quietest = 2.7×

Open Trend

Top flex glue search terms

flex glue30K/yr +32.9%7.9% conv.
pool sealant10K/yr +175.8%2.5% conv.
underwater sealant11K/yr +140.6%3.3% conv.
underwater magic pool sealant6K/yr +382.0%4.0% conv.
flex glue clear16K/yr -4.8%3.9% conv.
underwater glue for pools6K/yr +352.7%5.4% conv.
underwater glue7K/yr +174.8%5.2% conv.
flex seal glue7K/yr +79.4%6.7% conv.
pool glue underwater3K/yr +451.2%4.0% conv.
flex glue clear waterproof6K/yr +48.3%13.2% conv.

All search terms

Top flex glue 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 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Flex Glue Super Strong Transparent Rubberized Waterproof Adhesive Works Underwater Use on Pools Showers Outdoors Concrete Brick Pavers UV Resistant 4 oz Squeeze Tube Clear 1-Pack

FLEX GLUE$14.913.9★3,790 rev

Flex Glue Mini White Super Strong Rubberized Waterproof Adhesive Works Underwater Use On Pools Showers Outdoors Concrete Brick Pavers Masonry and UV Resistant 0.75 fl oz

FLEX GLUE$7.534.4★1,579 rev

J-B Weld 8277 WaterWeld Epoxy Putty Stick - 2 oz.

J-B Weld$6.304.2★13,730 rev

[3 oz] Marine Adhesive Sealant 5200 Fast Cure White Permanent Watertight Bond Above & Below Waterline UV Resistant Marine Caulk for Boats Hulls Decks & Fittings by Berkland American Owned

Berkland$13.964.5★438 rev

Epoxybond Pool Putty$21.044.5★4,966 rev

Newest

by launch date

Silicone Sealant for Aquariums Transparent Underwater Sealant: Strong Adhesion Waterproof and Highly Flexible (Transparent 50ml)

Tiltol$9.5920 rev

3mo ago

Pool Patch Underwater Pool Tile Adhesive (4 oz) Waterproof Pool Tile Setting Paste Professional Strength Adhesive for Ceramic Mosaic & Stone Works 100% Submerged No Need to Drain Pool

Pool Patch$23.9043 rev

4mo ago

Pool Putty 17.6oz/500g 2 Part Epoxy Pool Putty for Underwater or Above-Water Crack Leak Filling and Repair Sealing and Repair of Holes and Damage in Fiberglass Concrete and Tile Surfaces (White)

XUDOAI$18.5096 rev

7mo ago

[2-Pack] Marine Adhesive Sealant 5200 Fast Cure 10 oz White Permanent Watertight Bond Above & Below Waterline UV Resistant Marine Sealant for Boats Hulls Decks & Fittings American Owned

Berkland$34.8762 rev

9mo ago

Aquarium Safe Silicone Aquarium Silicone Transparent Underwater Sealant Waterproof Strong Adhesion Excellent Flexibility Suitable for Underwater bonding in Aquariums (120ml)

LANGXINST$11.9950 rev

9mo ago

What buyers say about flex glue

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

What buyers love

Adhesion/Stickiness15%

“Great adhesive”

Quality-Overall13%

“Excellent product”

Ease Of Use10%

“Easy to use”

Efficiency9%

“Worked good for me on plastic”

Advertised Vs Actual Product8%

“As advertised”

Water Resistance6%

“It is also waterproof”

Value For Money5%

“Great value for money”

Strength3%

“Very strong”

Leak-Proof3%

“No leaks”

Durability3%

“Durable”

What buyers complain about

Leak-Proof15%

“Started leaking immediately”

Adhesion/Stickiness14%

“Doesn't Stick”

Functionality-Overall11%

“Did not work”

Ease Of Use6%

“Not user friendly”

Value For Money5%

“Overpriced mess”

Advertised Vs Actual Product3%

“Deceptive picture”

Quality-Overall3%

“Poor product performance”

Water Resistance3%

“Does not work under water”

Color3%

“Set yellowish”

Size-Overall2%

“Pipe fitting Not good”

Top return reasons

Adhesion/Stickiness36%

Functionality-Overall12%

Advertised Vs Actual Product10%

Value For Money7%

Leak-Proof6%

Color5%

Size-Overall5%

Defective Material/Parts4%

Maintenance And Repair2%

Product Condition2%

Common questions

Is flex glue profitable to sell on Amazon United States?: The niche generates $141K/yr across 22 tracked products. 5 of 6 products launched in the last 360 days are still selling. 90-day search growth is +96.7%. Flapen's verdict: Worth a look (64/100).
How competitive is the flex glue niche?: 15 brands and 128 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 74% of demand.
What do buyers complain about in flex glue?: Top complaints mined from reviews: Leak-Proof, Adhesion/Stickiness, Functionality-Overall. The return rate is 1.1%.
When does demand for flex glue peak?: Demand peaks in Jun–Jul; the busiest month runs 2.7× the quietest.
What does it cost to enter the flex glue niche?: Listings span $6.30–$68.37; the average listing price is $21.43 (sweet spot $15–$100). The average incumbent carries 2,099 reviews — the moat a new listing must climb.