Bostik Cementone Rapid Setting Cement, For Interior & Exterior Use, Waterproof, Colour: Grey, 10kg

This is quick an easy especially for a no ice like me! Easy instructions enough on the bucket for several repair jobs, just add right amount of water, starts to set quickly so no waiting for it to harden, easy and pliable to work with, which I used my hands to fill in a 20mm wide trench across my kitchen floor which the concrete easily buried and sealed my conduit piping! So happy with it and plenty more in the large 10kg bucket! Loose powder form, then just add water simple!

Ce n’est pas très pratique. Il est impossible de mélanger tout le ciment à l’eau sauf à utiliser un mélangeur mécanique. Et la prise est très rapide.

The product was exactly as specified. Easy to use. Arrived on time. I am very pleased with the purchase.

The patio at the side of the house was laid badly where the motar was not of recommended mix during the winter months. Unknown to us it was virtuyally all sand with only a skim of cement mixture at very top. Therefore needed scoop it all out and re-point with proper mixture of cement & motar. Instead of using standard pack of 25kg cement at <£5, decided to use this as it is pre-mixed (but not ready-mixed; the user has to add water). By chance I ordered 3. This allowed most of the first bucket to be put into buckets 2 and 3 and leave 1kg or 2 kg in the first bucket with which to mix in some water. For the task above I could only manage to dig out on average 5 feet of old material between the slabs then re-point using this Bostik cement. This Bostik is expensive as compared to standard bag of cement but it is quick setting; strong enough for me to step on the slabs the next day to continue the task of repointing the other slabs. I have also a bucket of Blue Circle Extra Quck Setting cement, which is even more expensive, but which proved to be too quick setting for me to use - a professional brick layer may be proficiently fast to use that Blue Circle Extra Quick cement. I must also say it is mostly cement rather than a motar mixture. Also, depended how (quick or much) you use it, I could only use 1-2 kg at a time, some parts have dried white in colour, some sandy white, some light grey. At the moment noticed it tended to be sandy white from material at the bottom of the bucket - assuming heavier sand sunk to the bottom than the cement p;owder which stayed at the top of the bucket. After comparing with rest of the available versions of cement and different brands, conclusion is it may be expensive but fair as compared to standard and Extra Quick cement. It is also convenient to use; it is quick enough for me to continue work next day but slow enough for my lack of builders' skills (I am better at carpentry). More importantly, during this continued pandemic times, this remains available some of the time whereas standard bags of cement is like gold dust for their non-availability. Update. Been doing the pation repairs for a month or two for the past 4 years. The repairs I made in 2021 were done around October. Maybe the the cold night temperatures when it dropped to single figures, say 5 degrees or less, and with damp was the reason why the repairs did not last well; cracks in my handiwork showed up within a few months. (Yes it could also be my inexperience too). I am wondering if the freezing at night (expansion by ice ???) was the cause, but don't know for sure. It could also be that the locations were the worse parts of the patio so settled unevenly as we walked on it. Anyway, with these suspicions in mind, the repairs I made in 2025 were done from late August to last week of September, where the night temperatures were definitely no less than 8 degrees (according to Met Office forecast). Lo and behold, with all the rain of winter 25-26 and some freezing nights, no crack have yet shown themselves among the repairs made in 2025. (That's 6 months of the worse weather thrown at it.) Ergo, lesson learnt is, if there is a choice of wether conditions to do the repairs, select mild + dry days and nights. Another thing I discovered was that the "professional" patio layer short changed us. Didn't know that was possible until discovering there is way too low and insufficient sand below the Indian Sandstone slabs. This is another reason to use this Bostik as I was hoping by forcing as much as possible of this Bostik down into the gaps between the stones, some of it might go sideways when it reached underneath the stones to support them otherwise it would be a mega job to rip everything up to put more sand down before re-laying. So, apart from the repairs in 2021, all the subsequent years' efforts have held. (Yes it has been slow but it's not sensible to force the pace either because for each slab, one could only clear out one edge out of 4 edges at a time so as not to destabilise it entirely; hence could only repair one edge here and another edge of another slab a few slabs away etc. To repair one slab, it takes 8 days before it could be walked upon; one day per edge to be worked, a day between to dry secure.... so on.)) Now I am raising the score to 5 stars as I believe this is a good product for a DIY'er (after gaining a bit of experience of using it).

Ideal, seems seeping water in pinch from underground ground drain pipes, easy to mix!