can't remember the name of the stuff used but its the as sika sand filler.
why do you need to wet the paving slabs before and after?
is this to stop curing while you spread it?
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That's how it's designed to be laid. It's not cement based.
I used SIKA Fastfix and it's weird stuff with an oily film in the water. Make sure you pack it down with a pointing tool as it shrinks a bit when it dries.
The similar stuff I used, needed plenty of water as you brushed it into the gaps and used the water to clean off. You kept brushing in untill the gap was filled. Its big advantage over using pointing is that its incredibly fast to do, and you dont even have to bend over, so really good for old frats like me.
The one mentioned above claims to be water soluable, as though thats a good thing. I think its designed to be used when you lay the slabs with five dabs. The water runs through the filler, then under all the slabs and comes out the side into the lawn of flower bed.
Its okay for the first year of two but then the filler starts to clog up and attracts moss and all other kinds of *****. In the end you spend all your time looking after the poxy thing throught out the year. I dont recomend it. Get the job done properly. Slabs laid onto a solid base and then pointed up.