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61 reviews
Holt's Sealit- a premium leak sealer for your car.
I have used this and Holt's Radweld Plus with great success for many years.
I have found this is superior to products that cost 3 times as much and is very easy to use.
Just make sure you add it (with care due to hot liquids) when the engine is warmed up and circulating , so it goes straight into the system and isn't left in a non moving coolant bottle for ages.
This product is so good it can even seal small leaks in the head gasket which is a very difficult and expensive or repair to undertake if one chooses to replace the head gasket.Try this cure first.Read full review
Verified purchase: Yes • Condition: new • Sold by: roebuck10a
David smith
This seems to have fixed a leaking core plug. It does exactly what it says it does mg t type Dave
Verified purchase: Yes • Condition: new • Sold by: save_and_drive
Product Works
Coolant level sensor light kept coming on, so my car required topping up with coolant and water on a weekly basis, added this to the system following the instructions, after a month the system hasnt lost any coolant. Basically it works!Read full review
Verified purchase: Yes • Condition: new • Sold by: uhfdistribution
It works very well!
It's a well known product but yeah, it's pretty darn good! Been having to refill my cooling system daily for a couple of weeks. Filled it with coolant and half a bottle of this stuff, did the running it thing. Haven't had to put any more coolant in since!Read full review
Verified purchase: Yes • Condition: new • Sold by: exosltd
Replenished my stock, as used as a last resort to cure problem issues, as it is one of the only products that does really work, so always have some on
Replenished my stock, as used as a last resort to cure problem issues, as it is one of the only products that does really work, so always have some on the shelf.
Verified purchase: Yes • Condition: new • Sold by: gooddeals755
Great product and easy to use
Perfect. Stop my coolant leaks any only out half bottle
Verified purchase: Yes • Condition: new • Sold by: save_and_drive
radweld sealent
needs a good shake before use but has stopped my radiator system from leaking.
Verified purchase: Yes • Condition: new • Sold by: exosltd
Didn't work for me, might work for others.
followed instructions to the letter, flushed system and filled with new coolant, had a small leak at the thermostat housing, the product worked for a couple of days, but now leaking again. Might work for others, but didn't work for me.Read full review
Verified purchase: Yes • Condition: new • Sold by: motorseamus
Holts Sealit
Reluctant to try at first in case it caused more problems than it fixed .
Had a small leak on the radiator so finally decided to use it and very pleased with results.
Leak sealed with no other problems at all.Read full review
Verified purchase: Yes • Condition: new • Sold by: fixra_uk
Fast working leak repair
Really easy to use with all "how to do" on the label, no leaks after use at all! Top quality.
Verified purchase: Yes • Condition: new • Sold by: autoshopburyuk