Question Author
many thanks for your answers, and I am sorry that I put it under the wrong topic. I have managed to get the cement in the gaps but it does break up and crumble within a very short period of time, I assumed that I had the wrong mix but it was a bucket full that I had got from the building site up the road from me and assumed that it would be fine, also the dogs have managed to scrape some of it out, hence the reason that I thought of getting something that dries quick.