Bert Coules wrote:
Having just made my usual abject mess of laying a single course of
bricks (atop an existing low wall) I seriously wonder why I didn't
simply stick the damn things in place and fill the gaps with more of
the same adhesive. Centuries-old technology may be all well and good
if you can manage it, but for some jobs there are better alternatives.

I have one of those little decorative garden walls. One with sort of hollow
larger than brick things and a thin concrete trim on top. I don't know what
to call it.
One of the trims was insecure so I blasted some silicone under it. Mr Know
It All next door thought this was hilarious. 11 years later the trim is
still there and still secure.