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TimKay said..
What brand of silyl modified polyethers would you suggest
I use the mainstream clear ones, the ones available easily in your local shops, not the ones with additives for special uses.
Try to get them in small quantities, and close them without leaving room for air: ambient moisture trapped in the tube will make them cure. But if they do, the cured part is waterproof so the curing will stop at the surface, so you can still use the rest of the tube by piercing it and taping over it. This is why they must be used in thin layers, thick layers will not cure properly.
For instance I used UHU Max Repair, Pattex 100%, SADER Mega Strong... they work all perfectly for re-glueing pads.
For a (partial) list see the "Universelle Produkte" section of
www.wikidorf.de/reintechnisch/Inhalt/MSPolymerKlebstoffe and there is even some tests at the end (use Google Translate if you do not read German).