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SEN-LEAKSEALER | Sentinel Leak Sealer 1Litre

Leave-in additive for sealing minor leaks and weeping joints

Leak Sealer

This product is ideal for sealing small leaks or weeping joints on all types of indirect central heating systems.

It is an easy-to-administer solution to the problem of weeping joints or pinhole leaks and it is compatible with other Sentinel products. Sentinel Leak Sealer will not cause blockages within the system.


  • Seals all minor leaks
  • Easy to apply
  • Will not cause blockages within the system
  • Compatible with other Sentinel products
  • Readily dispersible
  • Suitable for all metals including aluminium
  • Compatible with elastomers
  • Non-toxic and non-irritant
  • Manufactured under a quality system conforming to ISO9001

Product Data Sheet

Safety Data Sheet

This product is an easy solution to small leaks or weeping joints in central heating systems. Ready to apply to the system.

Sentinel Leak Sealer is a straightforward way to take care of such leaks, which can develop into bigger issues if left unattended. Once inside the system, it will form a soft seal over the leaking area(s), normally within 24 hours. It is suitable for all types of indirect central heating systems and is compatible with other Sentinel products which may already be in the system.

1 litre Sentinel Leak Sealer is sufficient to treat a typical domestic system of up to 10 radiators. Larger systems should be dosed with twice this amount. After dosing is complete, the system should be operated normally for at least 15 minutes as heat is beneficial to the sealing process.

Open Systems: Dose via F&E cistern, via a by-pass feeder or use a Sentinel Dosing Vessel.

Sealed Systems: If the system is empty, add to any convenient point before filling. If full, use aSentinel Dosing Vessel to inject via the filling loop or other access point.

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