Cyclo Industries PermaStop is a one-step cooling system repair solution, designed to permanently stop a leak within 60 seconds. PermaStop is a high-concentrate formula that is boosted with copper activation technology. PermaStop’s copper blend is designed to keep seal activating particulars in motion longer, resulting in an effective sealant. PermaStop not only repairs a cooling system leak, but it also continues to fight against the leak long after the initial use of the product.