I can assure you that this product works and it works great. I personally use this product and have great results. So have thousands of our customers that have purchased it. If you actually take every proper step, you will find this out. Did you acid copper the part first? Is the part smooth or does it need some sealer concentrate? Are you cleaning the part properly to assure a good bond
As part of Tech. support I would like to ask what questions did you ask and what type of information did you give us when you called? Everyone in tech support uses this product with great results and I'am sure we haven't pointed you in the wrong direction. This has got to be something "you" are doing wrong.
Please contact our tech support if you need further assistance. Thank you.