Coolant leaks don’t have to result in costly repair bills, simply add K-Seal Coolant Leak Repair to your coolant system for a quick and permanent fix. K-Seal is scientifically tested, trusted by millions of customers worldwide, and the only coolant leak repair fluid carried by the AA, the UK’s largest roadside repair company. Its unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.