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Default Prevent weeds between patio slabs

I have these concrete slabs on my patio, each about 3 feet square,
arranged in a matrix. There is a gap between the slabs 1-2 inches
wide, and weeds like to grow through the gaps like mad. There is
gravel there now, but soil has started accumulating and it's not
keeping the weeds out (this is how it was when I moved in).

What I really want to do is dig the gravel out and put something
impervious in it's place. Something like concrete would be nice, but
I don't think that's the best solution. Any suggestions? The gaps
are fairly consistent, but not perfect I'm sure. A type of liquid
rubber, or anything else that can be poured in and allowed to set
would be ideal, but I have no idea what is available.

We have similar setup next to our patio, but installed over landscape
cloth and with larger river rock between the pavers. It has been in
place about 8 years. It evenually accumulates some soil here because
the lawn-care folks use the blower in the wrong direction (condo). If I
had it to do over again, I would have graded the soil a bit more so that
blown-in soil can wash out or be hosed out. We get almost no weed
growth, in spite of having a fair amount of soil now on top of the
landscape cloth. Other areas where we put only rock on top of landscape
cloth have no weed growth, but they are mainly shady areas where nothing
was growing in the first place (reason for putting in rock). We have
our grill on the pavers, and it isn't a problem to move it if we need
to. We have about 6" space between pavers. Smaller rock would probably
work but we like being able to blow it off without dislodging the stone.