LAUNCH Cooling System Stop Leak 400ml

£9.95
£9.95

£11.94 inc VAT

This LAUNCH Cooling System Stop Leak is designed to seal a leaking cooling system as a temporary measure but can also be used as a preventative. Highly effective at sealing leaks and designed to be completely removed with the coolant so it will not block the system when a permanent repair can be made.

Price is for 400ml bottle. Product code: 2951009

Why Use This Launch Product?

Many cooling system sealants offer what is called a permanent repair. This often leads to blockages or restrictions within the system and can have a detrimental effect. This product will not block the system and can be safely removed. When used as a preventative, it will work within the coolant and stop very small leaks before they become a running problem.

Key Features

Seals leaks in the cooling system — usable as a temporary measure or as a preventative treatment.
Designed to be completely removed with the coolant, so it will not block the system when a permanent repair is carried out.
Contains a lubricant to help lubricate the water pump.
When used as a preventative, works within the coolant to stop very small leaks before they become a running problem.

Main Benefits

Does not offer a “permanent” blockage-forming repair — avoids the restrictions many other sealants can leave behind.
Removed with the coolant at the next fluid change, so the system is left clear for a permanent repair.
Highly effective at sealing leaks, according to the Launch Tech UK chemicals brochure.
Includes a lubricant that also helps lubricate the water pump.
Proven under motorsport conditions: supplied to Alex Sinclair Racing at the 2025 Manx GP and used on an Aprilia 660 in extreme heat, where the bike “performed flawlessly keeping its contents exactly where they should be.”

  • DPF Fluids
  • Technical Fluids
200 In Stock

UK Mainland Delivery (including Scotland)

  • Free next working day delivery on all orders over £50 (excl. VAT)
  • Orders under £50 charges start from £3.50 (+ VAT) depending on weight
  • Orders are shipped via DPD with full tracking

Off-Mainland UK

  • Delivery charges start from £7.00 (+ VAT) depending on order size
  • Delivery time: 2 working days (tracked service)

European Delivery

  • Zone 1 & 2: £24.99 (+ VAT)
    (Belgium, Cyprus, Luxembourg, Netherlands, France, Germany, Greece, Malta, Switzerland)
  • Zone 3 & 4: £36.99 (+ VAT)
    (Austria, Denmark, Finland, Italy, Spain, Sweden, Eastern Europe, etc.)
Dispatch & Delivery Times
  • Orders placed before 12pm (Mon–Fri) are dispatched the same day
  • UK Mainland & Scotland orders are delivered next working day
  • Orders placed after 12pm may still be dispatched the same day, but this is not guaranteed
  • Orders placed on weekends or holidays will be processed the next working day
Order Tracking

Once your order has been dispatched, you will receive a tracking link via email (and SMS where available).

If you have any questions, please contact us at:
📧 enquiries@launchtech.co.uk
📞 01752 344989

GUARANTEE

If you are unsatisfied in any way at all, please return the unwanted item within 14 days of delivery date for a full refund or exchange. The item must be unused and retain its original labels & packaging. Sale items are not returnable or refundable.

RETURNS & EXCHANGES

If you think you need to return your item, the first step is to contact us by email (enquiries@launchtech.co.uk) or telephone 01752 968343). Please include a copy of the invoice and state the reason for returning the item and whether you would prefer an exchange or a refund.

Please note all refunds and exchanges are subject to the following terms and conditions.

For more information, please view our full returns policy.
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