Leak Stop Sealant Additive
A/C leak stop sealant additive for micro leaks and O-ring reconditioning
Leak Stop Sealant Additive
Leak Stop Sealant Additive is a liquid treatment injected into the air conditioning system. It circulates with the refrigerant and lubricant, helping seal micro leaks up to 0.3mm and recondition O-rings throughout the system.
It also remains inside the system, meaning if very small leaks form later, the additive can help seal them as they occur.
Best used for
✓ Small refrigerant leaks.
✓ O-ring shrinkage or minor seal seepage.
✓ Slow gas loss over time.
✓ Systems that hold some pressure
✓ Preventative protection after recharge or service.
Is this suitable for your vehicle?
Suitable for
✓ Slow refrigerant loss
✓ Micro leaks up to 0.3mm
✓ Slight O-ring seepage
✓ Systems that still hold some pressure
✓ Vehicles that lose cooling gradually
Not suitable for
✓ Large visible leaks.
✓ Stone-damaged condensers.
✓ Split pipes or broken hoses.
✓ Failed compressors.
✓ Systems that are completely open.
✓ Leaks larger than 0.3mm
What is leak stop sealant additive?
Leak Stop Sealant Additive is a specialist liquid injected into the vehicle’s A/C system. Once added, it travels around the air conditioning circuit with the refrigerant and compressor lubricant.
Its job is to help seal tiny leaks from the inside and re-expand rubber O-rings that may have dried, shrunk or started to seep. It is not a replacement for mechanical repair on large leaks, damaged pipes, failed condensers or broken compressors.
Micro leak sealing
Designed for leaks up to 0.3mm where a full component replacement may not be necessary.
O-ring reconditioning
Helps re-expand and condition O-rings around the A/C system to reduce small seal seepage.
Future protection
Remains in the system and can help seal new micro leaks if they form later.
❗This treatment is for micro leaks. It will not repair a cracked condenser, split pipe, damaged compressor, major leak, impact damage or a system that cannot hold pressure.
How it works
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What we do on site -
Initial pressure and leak check
We check whether the system has pressure and whether the issue looks suitable for sealant additive.
Recovery, vacuum or recharge preparation
Where needed, the system is recovered, vacuumed and prepared before the additive is introduced.
Sealant additive injection
The liquid additive is injected into the air conditioning system using suitable A/C equipment.
Circulates through the system
The additive travels around the system with the refrigerant and lubricant, reaching seals, O-rings, pipes and connection points.
Micro leak sealing
When the additive reaches a micro leak, it helps seal the escape point from inside the system.
Frequently Asked Questions -
Refrigerant Recovery & Vacuum
A recovery and vacuum service safely removes old refrigerant from the air conditioning system, then pulls the system into vacuum to remove trapped air, moisture, old vapour residue and contamination before recharge, repair or leak testing.
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What this service is for
This is the clean-up and preparation stage before proper aircon work.
✓ Before refrigerant recharging
✓ After replacing AC components or pipework
✓ Following system leaks or pressure loss
✓ When air contamination is present in the system
✓ When moisture ingress is suspected
✓ Before carrying out leak detection procedures
✓ When old or incorrect refrigerant must be removed
What is refrigerant recovery and vacuum?
Refrigerant recovery means removing existing refrigerant from the vehicle’s air conditioning system into proper recovery equipment. The system is then placed under vacuum, which helps remove air and moisture from the pipework, condenser, evaporator and lines.
This is usually carried out before a recharge, leak test, repair, part replacement, pressure test or major aircon service. It helps stop old refrigerant, air, moisture and contamination from being left inside the system.
Removes old refrigerant
Finds where refrigerant is escaping from the system.
Old refrigerant is recovered safely before new refrigerant is added or repairs are carried out.
Removes moisture & air
Vacuum pulls moisture and trapped air out of the system to protect components.
Repairs
Creates the correct starting point for recharge, leak testing, UV dye work or repairs.
Moisture inside an aircon system is bad. It can reduce cooling, cause internal corrosion, contaminate lubricant and lead to future component failure.
What We Do On Site -
Initial pressure check
We check whether the system still has pressure, is low, empty or showing abnormal readings.
Recover old refrigerant
Existing refrigerant is recovered safely rather than vented or mixed into the atmosphere.
Vacuum the system
The system is pulled into vacuum to remove air and moisture from the internal aircon circuit.
Vacuum hold / leak indication
A vacuum hold can help indicate whether the system may have a leak before recharge is attempted.
Prepare for the next step
Depending on the result, the system can move to recharge, nitrogen leak test, repair work or further diagnostics.
If a leak is found we explain repair options. Small seals and O-rings can often be fixed on site. Major repairs are quoted before work proceeds.