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Leak Sealer F4 is a internal leak sealer developed for use throughout a central heating system to seal small, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system, the product finds the area of oxygen ingress and forms a polymer to seal the pinhole. Effective within 1-24 hours after application, the unique sealing efficiency of this market-leading water treatment chemical has been proven to not cause blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices. A leak can be quickly and efficiently sealed, without the need for a complete system drain down.
We aim to get your order to you as quickly as possible.
All paint products are shipped within 1–3 working days, depending on stock availability and order volume.
Once your order has been dispatched, you will receive a tracking number so you can follow your delivery.
Please note that custom color-mixed paints cannot be returned. These products are mixed specifically for you, based on the color you select, and therefore cannot be resold.
We will, however, accept a return or provide a replacement if there is a manufacturing issue or if the color you received does not match the color ordered. If this happens, simply contact us with your order details and photos, and we’ll take care of it.
