Exhaust loose again

I fitted the flexi joint in the exhuast some time ago (https://bhhh.co.uk/exhaust-flexi/), I hoped that this would stop the joint between the exhuast down pipe and manifold from taking so much load and working free. Well, it’s worked free again, this time though I have applied an exhuast repair paste stuff which I think has fibre glass in it, so we’ll see how well that does.