---
title: "Waterproof Sealant — £122K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/waterproof-sealant"
last_updated: "2026-07-31T10:55:41.281Z"
locale: en
meta:
description: "Niche score 52/100 · £122K/yr market · 180K searches/yr · £9.31 avg price. Soft demand (-21.9% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 52/100 · £122K/yr market · 180K searches/yr · £9.31 avg price. Soft demand (-21.9% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Waterproof Sealant — £122K/yr Amazon UK Niche (2026) - Flapen"
---
# **waterproof sealant**
**Worth a look**
Shows low returns (0.6%), but soft demand (-21.9% this quarter) keeps it on the watch list.
Market size 28Growth 14Conversion 76Competition 68Returns 97Price range 16Avg price 28Brand share 68Review moat 37Quality gap 70
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****7.3%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Competition**
**Good****44%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Good****64%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,801**
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**](https://flapen.com/research/niches?market=uk&signal=no_dominant_brand "Top brand's click share < 20%")
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 ~~](https://flapen.com/research/methodology)
## **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.
5K3KSpike '24Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep · busiest ÷ quietest = 2.1×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/waterproof-sealant/trend)
## **Top waterproof sealant search terms**
- **waterproof sealant**57K/yr-39.1%4.3% conv. - **waterproof sealant outdoor**16K/yr+47.7%5.6% conv. - **clear waterproof sealant**15K/yr-35.9%6.3% conv. - **outdoor sealant**11K/yr-8.2%4.5% conv. - **outdoor silicone sealant waterproof**8K/yr+40.7%9.2% conv. - **water sealant**11K/yr-12.0%3.2% conv. - **outdoor sealant waterproof**8K/yr+10.4%8.4% conv. - **floor sealant**10K/yr-27.4%2.0% conv. - **external sealant waterproof**5K/yr-27.2%7.8% conv. - **water proof sealant**4K/yr-30.9%4.7% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/waterproof-sealant/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.
0%4%£5K8%£10K12%£15K16%£20K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**£7.64**4.4★4,231 rev](https://www.amazon.co.uk/dp/B0F9XKLF22) [2**Everbuild General Purpose Silicone Sealant Waterproof Suitable for Interior and Exterior Use Clear 280ml**Everbuild**£2.57**4.5★7,522 rev](https://www.amazon.co.uk/dp/B004F1VINS) [3**EVO-STIK Sticks Like Sh*t Waterproof Sealant Clear - 290ml - All-Purpose - Mould resistant**EVO-STIK**£6.47**4.5★1,127 rev](https://www.amazon.co.uk/dp/B01D8GQ11O) [4**Gorilla 1144110 All Conditions Sealant Silicone Clear 295ml**GORILLA**£9.02**4.6★5,330 rev](https://www.amazon.co.uk/dp/B07S19ZXRC) [5**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**£7.04**4.5★2,314 rev](https://www.amazon.co.uk/dp/B01G3OC9FU)
**~~View all top sellers →~~**
### **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**£16.63**43 rev6mo ago](https://www.amazon.co.uk/dp/B0GCKWKRXY) [**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**£9.63**59 rev10mo ago](https://www.amazon.co.uk/dp/B0FPM2CBV7) [**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**£7.64**4,231 rev11mo ago](https://www.amazon.co.uk/dp/B0F9XKLF22) [**Silicone Sealant | Clear Silicone Sealant with Finishing Tool For a Smooth & Professional Finish | Waterproof & Anti-Mould Protection**ADVANCEDSIL**£7.39**1,121 rev1y ago](https://www.amazon.co.uk/dp/B0F9Y5SD4G) [**Silicone Sealant Kitchen & Bathroom Silicone Sealant with Finishing Tool for a Smooth & Professional Finish | Waterproof & Anti-Mould Protection - 120g (WHITE 120g)**ADVANCEDSIL**£7.40**1,121 rev1y ago](https://www.amazon.co.uk/dp/B0F9Y5V3JB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**WYCOON Invisible Waterproof Sealant 1KG Transparent Liquid Sealant for Leak Repair Waterproof Adhesive Coating for Indoor & Outdoor Use Roof Bathroom Shower**WYCOON**£16.63**4.4★**▲ 163%**](https://www.amazon.co.uk/dp/B0GCKWKRXY) [**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**£7.64**4.4★**▲ 130%**](https://www.amazon.co.uk/dp/B0F9XKLF22) [**SCNK 1000g Transparent Waterproof Coating Agent Super Strong Waterproof Insulating Sealant Invisible Waterproofing Sealant for Roofs Walls Indoor and Outdoor Use**SCNK**£17.08**4.4★**▲ 124%**](https://www.amazon.co.uk/dp/B0DWRP7LPQ) [**Silicone Sealant Kitchen & Bathroom Silicone Sealant with Finishing Tool for a Smooth & Professional Finish | Waterproof & Anti-Mould Protection - 120g (WHITE 120g)**ADVANCEDSIL**£7.40**4.0★**▲ 60%**](https://www.amazon.co.uk/dp/B0F9Y5V3JB) [**Liquid Waterproof Sealant Clear TUFINEIN Invisible Anti-Leaking Sealant Agent Transparent Waterproof Coating Water-Based Indoor & Outdoor Roofs Walls Garden Anti Leakage Agent (500 G)**Tufinein**£9.91**4.4★**▲ 42%**](https://www.amazon.co.uk/dp/B0F9XHCLZT)
**~~View all trending →~~**
## **What buyers say about waterproof sealant**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**21%
*“very pleased with quality to date”*
**Advertised Vs Actual Product**13%
*“As advertised”*
**Value For Money**10%
*“Fair price”*
**Ease Of Use**10%
*“Easy to use”*
**Adhesion/Stickiness**7%
*“Strong and easy to use adhesive”*
**Efficiency**6%
*“it works superbly”*
**Leak-Proof**5%
*“it's not leaked”*
**Water Resistance**5%
*“It also appears impressively waterproof”*
**Strength**2%
*“The strong, durable seal gives us confidence it will last”*
**Durability**2%
*“still perfectly stable”*
### **What buyers complain about **
**Adhesion/Stickiness**14%
*“Poor adhesive”*
**Ease Of Use**13%
*“Not user friendly”*
**Leak-Proof**8%
*“item leaked everywhere”*
**Functionality-Overall**7%
*“doesnt do what it says it would”*
**Value For Money**5%
*“Not worth the price I feel”*
**Quality-Overall**4%
*“was so annoyed at the poor quality of this product that I felt compelled to do so”*
**Thickness**4%
*“Too thick and incredibly hard to squeeze out of tube”*
**Color**3%
*“Not recommend turned yellow after few days”*
**Durability**3%
*“Only works for a short while”*
**Size-Overall**3%
*“Small tube”*
### **Top return reasons **
**Color**38%
**Functionality-Overall**9%
**Adhesion/Stickiness**8%
**Size-Overall**6%
**Leak-Proof**5%
**Advertised Vs Actual Product**5%
**Defective Material/Parts**4%
**Ease Of Use**3%
**Value For Money**3%
**Compatibility-Overall**2%
## **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.
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