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Thanks. It's a place in Dublin who mainly do automotive parts but also do bikes. I have a feeling it may just been too aggressive. I can't hear anything rattling inside the frame thankfully.
Will keep riding it anyways and just see if it gets worse over time. Will fill in the hole when I manage to get some brazing kit sorted.
danielj-
Not too piss on your chips but I have a friend who had a couple frames powder coated (one at a cheap place that probably blasted too aggressively and one at a better place that should have known) and they both cracked within a fortnight of each other. I can’t help but think that the blasting and coating was the common denominator.
M_V
Generally ie it’s not a hard and fast rule, there would be debris rattling around inside the tubes if it’s corroding from the inside.
Of course, anything rattling around in there now could be blasting media rather than rust.
Where did you get it blasted and coated? Are they used to working in bikes? If not chances are they’ve blasted out too aggressively/with too abrasive a media and that’s the cause of the hole.