---
title: "Radweld — £141K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/automotive/radweld"
last_updated: "2026-08-09T10:40:14.260Z"
locale: en
meta:
description: "Niche score 44/100 · £141K/yr market · 93K searches/yr · £10.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · £141K/yr market · 93K searches/yr · £10.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Radweld — £141K/yr Amazon UK Niche (2026) - Flapen"
---
# **radweld**
**Skip it**
A concentrated shelf (top 5 take 85% of clicks) — this niche doesn't clear our bar today.
Market size 31Growth 22Conversion 97Competition 13Returns 97Price range 51Avg price 36Brand share 16Review moat 41Quality gap 70
**Conversion**
**Incredible****14.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Price range**
**Good****£3.40–£26.87**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,371.8**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Okay****£10.28**
avg listing price — sweet spot $15–$100
**Market size**
**Okay****£141K**
£141K/yr · 93K searches
**Growth**
**Bad****-5.3%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****94%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****85%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, radweld is a £141K/yr Amazon United Kingdom market (93K searches/yr). The top 5 brands hold 94% of demand. Verdict: Skip it — 44/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **radweld market data**
- **Units sold / yr**
- **15K–20K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **£154K–£206K**
- units × avg price
- **Conversion rate**
- **14.7%**
- **Avg BSR**
- **#86**
- **Page quality**
- **0%**
- **Prime**
- **60%**
- **Sponsored**
- **40%**
- **Out of stock**
- **3.0%**
- **Avg brand age**
- **63 months**
- **Avg seller age**
- **178 days**
## **Competition & brand share**
The top 5 products capture 85% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **—flat
**Sellers**
**66**
**Top-5 brand share**
**94%**
Top 20: 100%
**Top-5 click share**
**85%**
Top 20: 100%
**Open market**
**3%**
- Holts53% - K-Seal29% - Best Price Square5% - Liqui Moly4% - ERRECOM3% - Generic3% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -5.3% search growth over the last 90 days.
2K2KPrime Day '25Spike '25Black Friday '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/uk/automotive/radweld/trend)
## **Top radweld search terms**
- **k seal**16K/yr+13.3%7.4% conv. - **radweld**13K/yr+11.1%22.7% conv. - **coolant leak repair**11K/yr-6.7%15.4% conv. - **k seal coolant leak repair**13K/yr-35.6%10.9% conv. - **radweld coolant leak repair**9K/yr-15.6%23.8% conv. - **car radiator leak sealant**7K/yr-7.3%18.0% conv. - **rad weld stop leak**5K/yr+15.0%23.7% conv. - **kseal coolant leak repair**3K/yr+27.3%10.5% conv. - **rad weld**3K/yr+8.6%24.1% conv. - **radiator stop leak**3K/yr+5.6%14.1% conv. [**All search terms **](https://flapen.com/research/uk/automotive/radweld/search-terms)
## **Top radweld 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%10%£14K20%£28K30%£42K40%£56K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Holts Radweld Plus Coolant Leak Repair Total Coolant Leak Repair Industry Leading Car Radiator Leak Sealant Easy To Use Seal Engine Block Cylinder Head Hoses & More Suitable For All Cars 250ml**Holts**£6.23**4.5★2,572 rev](https://www.amazon.co.uk/dp/B004EP8JS2) [2**K-Seal Coolant Leak 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant**K-Seal**£10.23**4.4★13,415 rev](https://www.amazon.co.uk/dp/B001QT9KO6) [3**Holts LOYRW2R Radweld Cooling System Stop Leak & Radiator Repair 250ml**Holts**£3.40**4.5★1,416 rev](https://www.amazon.co.uk/dp/B000X2CR74) [4**Best Price Square Car Radiator & Hose Stop Leak Repair Additive 250ml Anti-Corrosion Coolant Sealant for Radiators Heater Cores Gaskets & Welded Joints in Cooling Systems**Best Price Square**£7.62**4.4★47 rev](https://www.amazon.co.uk/dp/B0FD4QZ4JK) [5**LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956**Liqui Moly**£5.41**4.5★2,340 rev](https://www.amazon.co.uk/dp/B00448L350)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Best Price Square Car Radiator & Hose Stop Leak Repair Additive 250ml Anti-Corrosion Coolant Sealant for Radiators Heater Cores Gaskets & Welded Joints in Cooling Systems**Best Price Square**£7.62**47 rev1y ago](https://www.amazon.co.uk/dp/B0FD4QZ4JK) [**ERRECOM Bluet Car Radiator Stop Leak 250 mL bottle**ERRECOM**£6.08**500 rev2y ago](https://www.amazon.co.uk/dp/B0CRZDTVLX) [**K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators**Generic**£14.07**139 rev2y ago](https://www.amazon.co.uk/dp/B0CQ7R1SNH) [**K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks 472ml**K-Seal**£26.87**602 rev11y ago](https://www.amazon.co.uk/dp/B00Q55SV6O) [**Holts Radweld Plus Coolant Leak Repair Total Coolant Leak Repair Industry Leading Car Radiator Leak Sealant Easy To Use Seal Engine Block Cylinder Head Hoses & More Suitable For All Cars 250ml**Holts**£6.23**2,572 rev15y ago](https://www.amazon.co.uk/dp/B004EP8JS2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**ERRECOM Bluet Car Radiator Stop Leak 250 mL bottle**ERRECOM**£6.08**4.2★**▲ 229%**](https://www.amazon.co.uk/dp/B0CRZDTVLX) [**Holts Radweld Plus Coolant Leak Repair Total Coolant Leak Repair Industry Leading Car Radiator Leak Sealant Easy To Use Seal Engine Block Cylinder Head Hoses & More Suitable For All Cars 250ml**Holts**£6.23**4.5★**▲ 40%**](https://www.amazon.co.uk/dp/B004EP8JS2) [**Holts LOYRW2R Radweld Cooling System Stop Leak & Radiator Repair 250ml**Holts**£3.40**4.5★**▲ 10%**](https://www.amazon.co.uk/dp/B000X2CR74) [**K-Seal Coolant Leak 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant**K-Seal**£10.23**4.4★**▼ 14%**](https://www.amazon.co.uk/dp/B001QT9KO6) [**Best Price Square Car Radiator & Hose Stop Leak Repair Additive 250ml Anti-Corrosion Coolant Sealant for Radiators Heater Cores Gaskets & Welded Joints in Cooling Systems**Best Price Square**£7.62**4.4★**▼ 17%**](https://www.amazon.co.uk/dp/B0FD4QZ4JK)
**~~View all trending →~~**
## **What buyers say about radweld**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Leak-Proof**23%
*“months later still no leaks”*
**Quality-Overall**19%
*“Excellent product”*
**Advertised Vs Actual Product**17%
*“Just as described”*
**Efficiency**10%
*“Does the job”*
**Ease Of Use**8%
*“Simple to use”*
**Value For Money**5%
*“Good price arrived ontime well packed”*
**Maintenance And Repair**4%
*“Its saved me time, stress, and a costly repair for now”*
**Functionality-Overall**2%
*“The product works”*
**Water Resistance**2%
*“SEals water well”*
**Instructions/User Manual/Troubleshooting**2%
*“it worked perfectly with the instructions being easy to follow”*
### **What buyers complain about **
**Leak-Proof**29%
*“got a leak”*
**Functionality-Overall**24%
*“Didn't work”*
**Value For Money**8%
*“it cost me £800”*
**Coolant**8%
*“It blocked and damaged your coolant System”*
**Ease Of Use**3%
*“it's a nightmare to get rid of it off”*
**Water Resistance**3%
*“My wifes old fiesta was losing water every day I had to top up the header tank every day before she went out”*
**Jamming/Clogging**2%
*“the heater core passages got clogged”*
**Heating**2%
*“Unfortunately the solution caused the heater matrix to block”*
**Advertised Vs Actual Product**2%
*“False claims and exaggerated”*
**Quality-Overall**2%
*“Absolute Rubbish”*
### **Top return reasons **
**Leak-Proof**25%
**Functionality-Overall**25%
**Compatibility-Overall**15%
**Defective Material/Parts**11%
**Value For Money**5%
**Quality-Overall**5%
**Coolant**3%
**Maintenance And Repair**3%
**Size-Overall**3%
**Product Condition**2%
## **Common questions**
- **Is radweld profitable to sell on Amazon United Kingdom?**
- The niche generates £141K/yr across 10 tracked products. 90-day search growth is -5.3%. Flapen's verdict: Skip it (44/100).
- **How competitive is the radweld niche?**
- 7 brands and 66 sellers compete. The top 5 products take 85% of clicks and top 5 brands hold 94% of demand.
- **What do buyers complain about in radweld?**
- Top complaints mined from reviews: Leak-Proof, Functionality-Overall, Value For Money. The return rate is 0.6%.
- **When does demand for radweld peak?**
- Demand is steady year-round — the busiest month runs 1.8× the quietest.
- **What does it cost to enter the radweld niche?**
- Listings span £3.40–£26.87; the average listing price is £10.28 (sweet spot $15–$100). The average incumbent carries 2,372 reviews — the moat a new listing must climb.
## **Related niches in Automotive**
- 66 [**conservatory roof cleaner**](https://flapen.com/research/uk/automotive/conservatory-roof-cleaner)£161K/yr+19.9%**Worth a look**- 66 [**12v water pump**](https://flapen.com/research/uk/automotive/12v-water-pump)£149K/yr+67.3%**Worth a look**- 66 [**car flags**](https://flapen.com/research/uk/automotive/car-flags)£60K/yr>1,000%**Worth a look**- 67 [**ac recharge kit**](https://flapen.com/research/uk/automotive/ac-recharge-kit)£241K/yr>1,000%**Worth a look**- 67 [**jockey wheel**](https://flapen.com/research/uk/automotive/jockey-wheel)£182K/yr+52.3%**Worth a look**- 67 [**car jack**](https://flapen.com/research/uk/automotive/car-jack)£873K/yr+21.6%**Launch it**[**All Automotive niches **](https://flapen.com/research/uk/automotive)