Filling small gaps on butt jointed patio

[onionsa]

So I’m a few days into my patio laying and have been wondering what I can use to fill the small gaps that some slabs have between them. The slabs are but jointed but due to imperfections some have.m a small gap. Is there a liquid or resin type of grout on the market that could be used?

Thanks.

 

[noseall]

Kiln dried sand.

 

[onionsa]

Thanks will look into that