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.

radweld

Skip it

A concentrated shelf (top 5 take 85% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible14.7%

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

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Quality gap

Good4.3★

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

Okay2,371.8

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

Bad94%

top-5 brand share — brand-locked demand

Competition

Bad85%

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

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

Top-5 brand share

94%

Top 20: 100%

Top-5 click share

85%

Top 20: 100%

Open market

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.

No pronounced peak months · busiest ÷ quietest = 1.8×

Open Trend

Top radweld search terms

k seal16K/yr +13.3%7.4% conv.
radweld13K/yr +11.1%22.7% conv.
coolant leak repair11K/yr -6.7%15.4% conv.
k seal coolant leak repair13K/yr -35.6%10.9% conv.
radweld coolant leak repair9K/yr -15.6%23.8% conv.
car radiator leak sealant7K/yr -7.3%18.0% conv.
rad weld stop leak5K/yr +15.0%23.7% conv.
kseal coolant leak repair3K/yr +27.3%10.5% conv.
rad weld3K/yr +8.6%24.1% conv.
radiator stop leak3K/yr +5.6%14.1% conv.

All 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.

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

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£6.234.5★2,572 rev

K-Seal Coolant Leak 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal£10.234.4★13,415 rev

Holts LOYRW2R Radweld Cooling System Stop Leak & Radiator Repair 250ml

Holts£3.404.5★1,416 rev

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£7.624.4★47 rev

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

Liqui Moly£5.414.5★2,340 rev

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£7.6247 rev

1y ago

ERRECOM Bluet Car Radiator Stop Leak 250 mL bottle

ERRECOM£6.08500 rev

2y ago

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

Generic£14.07139 rev

2y ago

K-Seal Ultimate Head Gasket & Block Repair | Seal & Fix Coolant Leaks 472ml

K-Seal£26.87602 rev

11y ago

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£6.232,572 rev

15y ago

What buyers say about radweld

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

What buyers love

Leak-Proof23%

“months later still no leaks”

Quality-Overall19%

“Excellent product”

Advertised Vs Actual Product17%

“Just as described”

Efficiency10%

“Does the job”

Ease Of Use8%

“Simple to use”

Value For Money5%

“Good price arrived ontime well packed”

Maintenance And Repair4%

“Its saved me time, stress, and a costly repair for now”

Functionality-Overall2%

“The product works”

Water Resistance2%

“SEals water well”

Instructions/User Manual/Troubleshooting2%

“it worked perfectly with the instructions being easy to follow”

What buyers complain about

Leak-Proof29%

“got a leak”

Functionality-Overall24%

“Didn't work”

Value For Money8%

“it cost me £800”

Coolant8%

“It blocked and damaged your coolant System”

Ease Of Use3%

“it's a nightmare to get rid of it off”

Water Resistance3%

“My wifes old fiesta was losing water every day I had to top up the header tank every day before she went out”

Jamming/Clogging2%

“the heater core passages got clogged”

Heating2%

“Unfortunately the solution caused the heater matrix to block”

Advertised Vs Actual Product2%

“False claims and exaggerated”

Quality-Overall2%

“Absolute Rubbish”

Top return reasons

Leak-Proof25%

Functionality-Overall25%

Compatibility-Overall15%

Defective Material/Parts11%

Value For Money5%

Quality-Overall5%

Coolant3%

Maintenance And Repair3%

Size-Overall3%

Product Condition2%

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.