stop leak
Skip it40/100a concentrated shelf (top 5 take 86% of clicks) — stop leak doesn't clear our bar today.
Market/yr
$284K
Growth (1y)
+133.8%
Products
9
Brands
5
was 8 a year ago
Sellers
74
Price range
$4.10–$22.51
Returns
1.5%
Rating
4.4★
Skip it
Scored 40/100 across market size, growth, competition, quality gap, and returns.
Demand
Weekly Amazon search volume, last 104 weeks — +133.8% year over year.Seasonality
Monthly demand index across the year — 1.00 is average.Peak months: Aug · busiest ÷ quietest = 1.7×
Competition
- K-Seal64%
- Bar's Leaks25%
- Liqui Moly5%
- Visbella4%
- ACDelco2%
The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack. 5 brands and 74 sellers compete here.
Brands
5 falling
was 8 a year ago
Sellers
74
Top 5 brand share
100%
Product shelf
All 9 tracked products in this niche.
K-Seal ST5501 Multi-Purpose One Step Coolant Leak Repair 8oz Pour and Go Mixes with All Antifreeze No Flushing Required
K-Seal
$12.564.3★13,323 reviews
Bars Leaks Cooling System Radiator Stop Leak 16.9 oz.
Bar's Leaks
$7.774.3★3,820 reviews
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair 16 oz Pour and Go Mixes with All Antifreeze No Flushing Required
K-Seal
$20.274.4★1,665 reviews
K-Seal ST3501 Pour & Go Head Gasket Sealer 16 oz Repairs Blown Head Gaskets Cracked Heads & Engine Blocks
K-Seal
$22.514.1★2,109 reviews
Bars Leaks 1109 Liquid Copper Block Seal Intake and Radiator Stop Leak 18 oz. | One Step Safe for All Cooling Systems
Bar's Leaks
$8.074.3★1,506 reviews
Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132
Liqui Moly
$12.754.4★655 reviews
Visbella Radiator Stop Leak Sealer Conditioner Radiator Repair Kit Car Heater Core Freeze Plugs Cooling System & Radiator Repair (Tube pcs 1)
Visbella
$8.064.5★154 reviews
Bars Leaks Radiator Stop Leak 11 oz
Bar's Leaks
$4.994.4★232 reviews
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Stop leak”
“Works well”
“Worth the purchase”
“quality are all good”
“Works as advertised”
“Stopped my coolant leak”
“Easy peasy”
“Followed the directions”
“that it would not affect the repair”
“its still holding”
What buyers complain about
“Had a leak”
“Did not work”
“If you have a slight loss of coolant or a head gasket that is just starting to leak”
“Repairs are ridiculous”
“Car started overheating again”
“clogs”
“Lasted exactly 7 miles when followed directions exactly ending in large fail”
“which is expensive ($4500 quoted for my last car).”
“Trash”
“Does not last”
Top return reasons
- Leak-Proof20%
- Coolant19%
- Functionality-Overall16%
- Compatibility-Overall10%
- Maintenance And Repair7%
- Defective Material/Parts6%
- Value For Money6%
- Advertised Vs Actual Product5%
- Product Condition3%
- Size-Overall2%