As long gone as the first customer has been informed that you are injecting this product into their system then fine with me. I would feel shallow to walk away from a repair that the homeowner problem could have done themselves. Poor installations., and ancient equipment and temporary fixes is what this product should be used for or you are not ethically fulfilling a HVAC/REFRIGERATION mechanics to properly repair a leak under the universal guidelines of what is expected. If I brought my truck to have a flat tire repaired and the mechanic dumped some fix a flat in it and told me I'm all set it would be disheartening as I might as well go to my local walmart and have my girlfriend "install" some fix a flat fee. Hahaha