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how big is the gap?? I have used ET515 personally for bonding inserts and its been a good bond. You need to key the alloy properly. Some people go as far as putting grooves in or even knurling the end to be inserted.
I guess you are using roll wrapped tubing?? Almost all roll wrapped tubes will come from the factory with a heavy coating of release agent still inside the tube, so you really need to ensure it is gone to get a good bond.
Some photos would be ideal.
If you're still having problems getting a good bond after that, then return us the glue and we will test it. It is theoretically possible to have a bad batch, although this has not happened to us yet.
Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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