Seals
Seals minor leaks. As it circulates, a plastic-like layer forms over leaks, inside and out.
Cooling system sealant, cleaner and lubricant
Stop the leak. Keep it cool.
Sealwel seals minor radiator leaks, cleans out your cooling system and lubricates the water pump. Drop it in, drive 5 km, done.
Made in Rangiora, New Zealand by Auto Agencies
75 yearsSealing well for generations
Race testedProven on the track
NZ madeManufactured in Rangiora
4-in-1Seals, cleans, lubricates, conditions
What it does
More than a radiator stop-leak
Most stop-leak products only plug holes. Sealwel works through your whole cooling system, so it suits a car with a leak today and a car you want to keep leak-free.
Cleans
Cleans the engine waterways, hoses and radiator so coolant flows freely.
Lubricates
Lubricates the water pump bearings, helping the pump run smoothly and last longer.
Conditions
Keeps the whole system in good shape. Many engine rebuilders add it to every rebuild as insurance against leaks.
Works with coolantWorks with antifreezeOne cube treats about 10 litres
The range
Cubes or powder. Same Sealwel.
Sealwel Cubes
Two cubes in a pack. Crumble one straight into the radiator or dissolve it in hot water first.
Each cube treats about 10 litres of cooling system.
Sealwel Powder
The cube as a powder. A single dose in its own jar: just add water, shake and pour.
One pack per vehicle. Larger vehicles may need two.
Workshop packs
Loose cubes in bulk for mechanics, radiator shops and engine rebuilders.
Trade only. Order through Auto Agencies.
New-look Sealwel packaging is on its way. Same formula, fresh design.
How to use
In, drive, done.
1 cubetreats about 10 litres of radiator capacity. Check your vehicle's cooling system capacity and use more cubes if needed.
- Add it while the engine is warm, not hotSealwel works best in a warm system. Open the radiator cap slowly with a rag over it.
- Add the cubeCrumble the cube straight into the radiator or top hose, or dissolve it in hot water first and pour it in.
- Drive 5 kmThis circulates Sealwel through the system. A plastic-like layer forms over any leaks, inside and out.
- Re-treat if neededTreat again after 5,000 to 8,000 km if necessary.
1 jaris a single dose. Larger vehicles may need 2 packs.
- Half fill the jar with cold waterFill to the "Add Water to Here" line on the label.
- Shake to mixScrew the lid on tight and shake until the powder is mixed through.
- Pour into the radiatorPour the mixture in, top up the radiator and replace the cap.
- Run the engine for 10 minutesRun it at normal operating temperature so Sealwel circulates through the system.
- Check the level once coolRecheck the water level when the engine has cooled down and top up if needed.
Safety
Keep out of reach of children. Contains sulphur. If swallowed, seek medical advice. Wash your hands after use.
Do not use more than 1 cube per 5 litres of cooling system capacity.
Never remove a radiator cap from an engine that's hot. Coolant is under pressure and can scald.
Where to buy
Get Sealwel
Ask at your local parts store
Ask for Sealwel at your local auto parts store. If it's not on the shelf, they can order it in from Auto Agencies. Show them these codes:
Twin Pack cubes T5101-2
Powder single T5100-1
Mechanics and trade
Workshops, parts stores and radiator shops can order Sealwel through Auto Agencies, including bulk cube packs.
Trade ordersNeed a hand?
Can't find it locally? Get in touch and we'll help you get Sealwel.
03 313 7709
sales@autoagencies.co.nz
Questions
Good to know
What kind of leaks does Sealwel fix?
Sealwel seals minor leaks and seepage in the cooling system. As it circulates, a plastic-like layer forms over leaks, inside and out. A large crack, split hose or failed head gasket needs a proper repair.
Can I use it with coolant or antifreeze?
Yes. Sealwel can be used with coolant and antifreeze, so there's no need to drain your system first.
How much do I need?
One cube treats about 10 litres of radiator capacity. One powder jar is a single dose for most vehicles, and larger vehicles may need two.
Can I use it when there's no leak?
Yes. Sealwel also cleans the system and lubricates the water pump bearings, so many mechanics add it as routine maintenance and after an engine rebuild. Re-treat every 5,000 to 8,000 km if needed.
Cubes or powder: which should I buy?
They do the same job. The powder is the cube in powder form. Cubes let you match the dose to your radiator size. The powder jar is a ready-measured single dose that you mix with water.
Where is Sealwel made?
Sealwel has been sealing well for 75 years and is now made in New Zealand by Auto Agencies, a family-owned automotive parts business in Rangiora, Canterbury.