When coming in contact with the atmosphere, it forms a seal over the leak.If your system stays charged for one day whne running, this product will fix most leaks that you may encounter. . If there is air and water in your system, pull a edep vac on the system and boil moisture out of the system. This will prevent proseal from reacting inside your system. Proseal xl4 has twice as much sealing agent as regular proseal. It is great for repairing those recurring leaks in systems.

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