













🚀 Leak-proof your ride in minutes — because your engine deserves the best!
K-Seal is a professional-grade, synthetic resin coolant system additive that permanently seals leaks in water-cooled engines. Compatible with all antifreeze types and suitable for cars and light trucks up to 12 cylinders, it requires no draining or flushing—just shake, pour, and drive. Trusted by mechanics and independently tested to ASTM D3147 standards, K-Seal offers a fast, durable, and cost-effective solution to radiator, head gasket, freeze plug, block, heater matrix, and water pump leaks.










| ASIN | B001QT9KO6 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 860 in Automotive ( See Top 100 in Automotive ) 8 in Fillers, Adhesives & Sealants |
| Colour | clear |
| Customer Reviews | 4.4 4.4 out of 5 stars (12,951) |
| Date First Available | 15 Nov. 2009 |
| Item Package Quantity | 1 |
| Item Weight | 260 g |
| Item model number | ST5501 |
| Manufacturer | K-Seal |
| Material | Synthetic Resin |
| Part number | ST5501 |
| Product Dimensions | 8.89 x 3.81 x 11.43 cm; 260 g |
| Style | Compact |
| Volume | 236 Millilitres |
B**S
It genuinely works!
It’s amazing stuff. Sorted a mysterious coolant leak in minutes. First time since I got the car that I haven’t had to top up after a long journey. Seems to be a permanent fix too.
T**E
Great value
Worked so goo, great value for the money
M**Y
Car coolant leak
Good product helppul
N**L
Good product
Does exactly what its meant to do, very easy to use, just pour into coolant tank.
J**N
Actual long term solution for minor coolant leaks in hard to reach places
Put this in a Citroen DS3 1.6 vti a year ago as it had a small leak on the oil cooler. After a year the coolant has only started to drop again - ordered some more, better than removing the manifold etc!
S**B
Not happy
Didn't worked as expected
J**N
Good product as expected
Good product as expected
D**K
highly recommend
car was leaking coolant slowly, put in and no more warning about coolant low level, been 12 months already, highly recommend
G**X
Great product
C**N
Seems to stop leaking from plastic header of the radiator.
M**N
Fungerade mycket bra. Jag är nöjd. Bara att skaka burke jättenoga först. Sen hel i allt
I**U
efficace dès la 1ere utilisation. plus de problemes de fuite depuis. un miracle ? pour le prix cela vaut le coup de l'essayer plutot que d'engager de gros frais pour les réparations.
C**N
Utilizzato con molto scetticismo un mese fa su di una fiat punto che consumava da tempo acqua e a freddo andava a tre cilindri perché la candelasi bagnava.. Ha funzionato alla perfezione,il primo giorno ha smesso di andare a "tre" e nel giro di pochi il consumo di acqua si è fermato definitivamente. Al momento altamente consigliato.
Trustpilot
2 weeks ago
2 months ago