Is waterproof sealant profitable to sell on Amazon United Kingdom?

The niche generates £122K/yr across 36 tracked products. 3 of 7 products launched in the last 360 days are still selling. 90-day search growth is -21.9%. Flapen's verdict: Worth a look (52/100).

How competitive is the waterproof sealant niche?

21 brands and 209 sellers compete. The top 5 products take 44% of clicks and top 5 brands hold 64% of demand.

What do buyers complain about in waterproof sealant?

Top complaints mined from reviews: Adhesion/Stickiness, Ease Of Use, Leak-Proof. The return rate is 0.6%.

When does demand for waterproof sealant peak?

Demand peaks in Sep; the busiest month runs 2.1× the quietest.

What does it cost to enter the waterproof sealant niche?

Listings span £2.57–£17.33; the average listing price is £9.31 (sweet spot $15–$100). The average incumbent carries 2,801 reviews — the moat a new listing must climb.

waterproof sealant

Worth a look

Shows low returns (0.6%), but soft demand (-21.9% this quarter) keeps it on the watch list.

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Conversion

Great7.3%

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

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Competition

Good44%

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

Brand share

Good64%

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

Review moat

Okay2,801

avg incumbent reviews — the moat a new listing must climb

Market size

Okay£122K

£122K/yr · 180K searches

Avg price

Okay£9.31

avg listing price — sweet spot $15–$100

Price range

Bad£2.57–£17.33

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

Growth

Bad-21.9%

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

Signals No Dominant Brand

According to Flapen's Amazon United Kingdom niche tracking, waterproof sealant is a £122K/yr Amazon United Kingdom market (180K searches/yr). The top 5 brands hold 64% of demand. Demand peaks in Sep. Verdict: Worth a look — 52/100.

Data updated Jul 22, 2026 · scored weekly · How we score niches

waterproof sealant market data

Units sold / yr: 13K–15K; avg 100–250/product
Revenue / yr: £116K–£140K; units × avg price
Conversion rate: 7.3%
Avg BSR: #108
Page quality: 0%
Prime: 94%
Sponsored: 92%
Out of stock: 4.0%
Avg brand age: 41 months
Avg seller age: 167 days

Competition & brand share

The top 5 products take 44% of clicks — established leaders, but buyers still shop beyond them.

Brands

21 falling

Sellers

209

Top-5 brand share

64%

Top 20: 99%

Top-5 click share

44%

Top 20: 83%

Open market

30%

Tufinein19%
Everbuild13%
GORILLA13%
Unibond11%
EVO-STIK9%
Sika6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -21.9% search growth over the last 90 days.

Peak months: Sep · busiest ÷ quietest = 2.1×

Open Trend

Top waterproof sealant search terms

waterproof sealant57K/yr -39.1%4.3% conv.
waterproof sealant outdoor16K/yr +47.7%5.6% conv.
clear waterproof sealant15K/yr -35.9%6.3% conv.
outdoor sealant11K/yr -8.2%4.5% conv.
outdoor silicone sealant waterproof8K/yr +40.7%9.2% conv.
water sealant11K/yr -12.0%3.2% conv.
outdoor sealant waterproof8K/yr +10.4%8.4% conv.
floor sealant10K/yr -27.4%2.0% conv.
external sealant waterproof5K/yr -27.2%7.8% conv.
water proof sealant4K/yr -30.9%4.7% conv.

All search terms

Top waterproof sealant 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Liquid Waterproof Sealant Clear TUFINEIN Invisible Anti-Leaking Sealant Agent Transparent Waterproof Coating Water-Based Indoor & Outdoor Roofs Walls Garden Anti Leakage Agent (300 G)

Tufinein£7.644.4★4,231 rev

Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use Clear 280ml

Everbuild£2.574.5★7,522 rev

EVO-STIK Sticks Like Sh*t Waterproof Sealant Clear - 290ml - All-Purpose - Mould resistant

EVO-STIK£6.474.5★1,127 rev

Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml

GORILLA£9.024.6★5,330 rev

UniBond Outdoor Window and Door Frame Sealant Premium Silicone Sealant Suitable for Use on Various Materials* Waterproof and Weather Resistant White 1 x 392g Cartridge

Unibond£7.044.5★2,314 rev

Newest

by launch date

WYCOON Invisible Waterproof Sealant 1KG Transparent Liquid Sealant for Leak Repair Waterproof Adhesive Coating for Indoor & Outdoor Use Roof Bathroom Shower

WYCOON£16.6343 rev

6mo ago

Gorilla Grab & Seal 290ml Two-in-One Waterproof Grab Adhesive & Sealant Hybrid | Bonds Skirting Kitchens Bathrooms Windows & Doors | High Strength Mould Resistant Paintable All-Weather Use

GORILLA£9.6359 rev

10mo ago

Liquid Waterproof Sealant Clear TUFINEIN Invisible Anti-Leaking Sealant Agent Transparent Waterproof Coating Water-Based Indoor & Outdoor Roofs Walls Garden Anti Leakage Agent (300 G)

Tufinein£7.644,231 rev

11mo ago

Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection

ADVANCEDSIL£7.391,121 rev

1y ago

Silicone Sealant Kitchen & Bathroom Silicone Sealant with Finishing Tool for a Smooth & Professional Finish | Waterproof & Anti-Mould Protection - 120g (WHITE 120g)

ADVANCEDSIL£7.401,121 rev

1y ago

What buyers say about waterproof sealant

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

What buyers love

Quality-Overall21%

“very pleased with quality to date”

Advertised Vs Actual Product13%

“As advertised”

Value For Money10%

“Fair price”

Ease Of Use10%

“Easy to use”

Adhesion/Stickiness7%

“Strong and easy to use adhesive”

Efficiency6%

“it works superbly”

Leak-Proof5%

“it's not leaked”

Water Resistance5%

“It also appears impressively waterproof”

Strength2%

“The strong, durable seal gives us confidence it will last”

Durability2%

“still perfectly stable”

What buyers complain about

Adhesion/Stickiness14%

“Poor adhesive”

Ease Of Use13%

“Not user friendly”

Leak-Proof8%

“item leaked everywhere”

Functionality-Overall7%

“doesnt do what it says it would”

Value For Money5%

“Not worth the price I feel”

Quality-Overall4%

“was so annoyed at the poor quality of this product that I felt compelled to do so”

Thickness4%

“Too thick and incredibly hard to squeeze out of tube”

Color3%

“Not recommend turned yellow after few days”

Durability3%

“Only works for a short while”

Size-Overall3%

“Small tube”

Top return reasons

Color38%

Functionality-Overall9%

Adhesion/Stickiness8%

Size-Overall6%

Leak-Proof5%

Advertised Vs Actual Product5%

Defective Material/Parts4%

Ease Of Use3%

Value For Money3%

Compatibility-Overall2%

Common questions

Is waterproof sealant profitable to sell on Amazon United Kingdom?: The niche generates £122K/yr across 36 tracked products. 3 of 7 products launched in the last 360 days are still selling. 90-day search growth is -21.9%. Flapen's verdict: Worth a look (52/100).
How competitive is the waterproof sealant niche?: 21 brands and 209 sellers compete. The top 5 products take 44% of clicks and top 5 brands hold 64% of demand.
What do buyers complain about in waterproof sealant?: Top complaints mined from reviews: Adhesion/Stickiness, Ease Of Use, Leak-Proof. The return rate is 0.6%.
When does demand for waterproof sealant peak?: Demand peaks in Sep; the busiest month runs 2.1× the quietest.
What does it cost to enter the waterproof sealant niche?: Listings span £2.57–£17.33; the average listing price is £9.31 (sweet spot $15–$100). The average incumbent carries 2,801 reviews — the moat a new listing must climb.