---
title: "Thompsons Water Seal — £59K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/thompsons-water-seal"
last_updated: "2026-07-31T11:25:47.159Z"
locale: en
meta:
description: "Niche score 42/100 · £59K/yr market · 20K searches/yr · £18.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · £59K/yr market · 20K searches/yr · £18.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Thompsons Water Seal — £59K/yr Amazon UK Niche (2026) - Flapen"
---
# **thompsons water seal**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 15Growth 32Conversion 97Competition 2Returns 97Price range 81Avg price 84Brand share 0Review moat 55Quality gap 47
**Conversion**
**Incredible****15.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****£18.48**
avg listing price — sweet spot $15–$100
**Price range**
**Great****£10.76–£34.29**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****1,283.5**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+5.3%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****£59K**
£59K/yr · 20K searches
**Competition**
**Bad****97%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United Kingdom niche tracking, thompsons water seal is a £59K/yr Amazon United Kingdom market (20K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 42/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **thompsons water seal market data**
- **Units sold / yr**
- **2K–3K**
- avg 250–500/product
- **Revenue / yr**
- **£37K–£46K**
- units × avg price
- **Conversion rate**
- **15.7%**
- **Avg BSR**
- **#524**
- **Page quality**
- **0%**
- **Prime**
- **67%**
- **Sponsored**
- **17%**
- **Out of stock**
- **2.2%**
- **Avg brand age**
- **61 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products capture 97% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**3 **▼falling
**Sellers**
**40**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**97%**
Top 20: 100%
**Open market**
**0%**
- Thompson's60% - Ronseal34% - SAFEGUARD6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +5.3% search growth over the last 90 days.
700500Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Sep · busiest ÷ quietest = 2.7×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/thompsons-water-seal/trend)
## **Top thompsons water seal 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%15%£9K30%£18K45%£26K60%£35K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**RONSEAL 36286 Thompsons Water Seal 5 Litre (TWSEAL5L) Clear**Thompson's**£17.42**4.5★2,956 rev](https://www.amazon.co.uk/dp/B002SHNRHQ) [2**TWSU5L 5L Thompsons One Coat Water-Seal**Ronseal**£20.48**4.5★1,236 rev](https://www.amazon.co.uk/dp/B001GU2EIO) [3**Ronseal TWSEAL1L Thompsons Water Seal 1 Litre**Ronseal**£10.76**4.4★560 rev](https://www.amazon.co.uk/dp/B002SHPSCS) [4**Raincheck Water Seal 5 Litre - Breathable Clear Exterior Brick Stone Mortar & Concrete Sealer**SAFEGUARD**£14.37**4.4★2,451 rev](https://www.amazon.co.uk/dp/B00UG64U68) [5**Ronseal TWSEAL25L Thompsons Water Seal 2.5 Litre**Ronseal**£13.58**4.5★398 rev](https://www.amazon.co.uk/dp/B002SHLQVU)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Raincheck Water Seal 5 Litre - Breathable Clear Exterior Brick Stone Mortar & Concrete Sealer**SAFEGUARD**£14.37**2,451 rev11y ago](https://www.amazon.co.uk/dp/B00UG64U68) [**2 x Thompsons Water Seal Waterproofer & Protector Brick Concrete Stone 5 Litre**Thompson's**£34.29**100 rev12y ago](https://www.amazon.co.uk/dp/B01EWTY21M) [**RONSEAL 36286 Thompsons Water Seal 5 Litre (TWSEAL5L) Clear**Thompson's**£17.42**2,956 rev19y ago](https://www.amazon.co.uk/dp/B002SHNRHQ) [**TWSU5L 5L Thompsons One Coat Water-Seal**Ronseal**£20.48**1,236 rev19y ago](https://www.amazon.co.uk/dp/B001GU2EIO) [**Ronseal TWSEAL1L Thompsons Water Seal 1 Litre**Ronseal**£10.76**560 rev19y ago](https://www.amazon.co.uk/dp/B002SHPSCS)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**2 x Thompsons Water Seal Waterproofer & Protector Brick Concrete Stone 5 Litre**Thompson's**£34.29**4.5★**▲ 177%**](https://www.amazon.co.uk/dp/B01EWTY21M) [**Raincheck Water Seal 5 Litre - Breathable Clear Exterior Brick Stone Mortar & Concrete Sealer**SAFEGUARD**£14.37**4.4★**— 7%**](https://www.amazon.co.uk/dp/B00UG64U68) [**RONSEAL 36286 Thompsons Water Seal 5 Litre (TWSEAL5L) Clear**Thompson's**£17.42**4.5★**— 5%**](https://www.amazon.co.uk/dp/B002SHNRHQ) [**TWSU5L 5L Thompsons One Coat Water-Seal**Ronseal**£20.48**4.5★**— 9%**](https://www.amazon.co.uk/dp/B001GU2EIO) [**Ronseal TWSEAL1L Thompsons Water Seal 1 Litre**Ronseal**£10.76**4.4★**▼ 16%**](https://www.amazon.co.uk/dp/B002SHPSCS)
**~~View all trending →~~**
## **What buyers say about thompsons water seal**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**29%
*“Good product did what was needed”*
**Advertised Vs Actual Product**15%
*“does the job”*
**Value For Money**10%
*“good value for money”*
**Water Resistance**10%
*“it waterproofs the wall”*
**Ease Of Use**9%
*“Easy to use”*
**Spray/Flow**7%
*“Easy to spray on”*
**Efficiency**5%
*“works really well”*
**Leak-Proof**3%
*“Stopped a leaky balcony wall”*
**Floor Protection**3%
*“Great for roof tiles”*
**Functionality-Overall**3%
*“It works, kind of”*
### **What buyers complain about **
**Functionality-Overall**50%
*“Did not work at all”*
**Value For Money**50%
*“Waste of time and money”*
### **Top return reasons **
**Paint Quality**37%
**Functionality-Overall**11%
**Size-Overall**7%
**Certifications**7%
**Leak-Proof**7%
**Thickness**7%
**Advertised Vs Actual Product**6%
**Material Quality**4%
**Instructions/User Manual/Troubleshooting**4%
**Ease Of Use**4%
## **Common questions**
- **Is thompsons water seal profitable to sell on Amazon United Kingdom?**
- The niche generates £59K/yr across 6 tracked products. 90-day search growth is +5.3%. Flapen's verdict: Skip it (42/100).
- **How competitive is the thompsons water seal niche?**
- 3 brands and 40 sellers compete. The top 5 products take 97% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in thompsons water seal?**
- Top complaints mined from reviews: Functionality-Overall, Value For Money. The return rate is 0.6%.
- **When does demand for thompsons water seal peak?**
- Demand peaks in Aug–Sep; the busiest month runs 2.7× the quietest.
- **What does it cost to enter the thompsons water seal niche?**
- Listings span £10.76–£34.29; the average listing price is £18.48 (sweet spot $15–$100). The average incumbent carries 1,284 reviews — the moat a new listing must climb.
## **Related niches in DIY & Tools**
- 68 [**cardboard cutter**](https://flapen.com/research/uk/diy-tools/cardboard-cutter)£343K/yr+30.6%**Worth a look**- 68 [**door canopy**](https://flapen.com/research/uk/diy-tools/door-canopy)£202K/yr+187.7%**Worth a look**- 68 [**fence post repair**](https://flapen.com/research/uk/diy-tools/fence-post-repair)£359K/yr-8.2%**Worth a look**- 68 [**cat window guard**](https://flapen.com/research/uk/diy-tools/cat-window-guard)£98K/yr+413.1%**Worth a look**- 68 [**sun shade**](https://flapen.com/research/uk/diy-tools/sun-shade)£202K/yr+187.7%**Worth a look**- 69 [**brass hose connector**](https://flapen.com/research/uk/diy-tools/brass-hose-connector)£66K/yr+122.8%**Worth a look**[**All DIY & Tools niches **](https://flapen.com/research/uk/diy-tools)