thanks for the link - but as you know, I'm a cheapskate bodger

(I just use cheapo superglue and sprinkle baking powder on/into the liquid as a 'filler' - lots of stuff on Youtube about it, and the chemistry behind it)...
... the chemistry is the same, and a lot cheaper

The problem I have found is that cyanoacrylate, by it's chemical definition, doesn't work on everything and if there are any contaminants on the surfaces, it's not always easy to get a permanent bond. As with many things, less is more... if the layer of glue is too thick, it tends to suffer from chemical shear and basically 'snap'.... many people see it as a failure of the glue, and it's ability to bond to the surface, but the surface bond isn't the bit that breaks. The molecules stick to the surface far better than to each other.
I tend to only use it on freshly-broken bits with a clean and easily positioned repair - otherwise, a small dab to hold it in place and surround the repair with something suitable to keep it there.