Drying Times : Working Time: up to 30 minutes, Surface Set: 6 to 36 hours, Full Cure: 10 to 48 hours At 20°C, 72% RH The Bostik Cementone General Purpose Mortar is a standard cement mortar for those who like to go old school/traditional in their stonework. This product is a pre-mix of sand and cement in the correct proportions. You just have to add the right amount of water, and you’re told how much to add to the tub. Mix it all up and you’re done. As long as you put at least 5cm of water on top of the left-over grout in the tub, it keeps for about a year.

The mortar cement in the tube comes ready to use. Just squeeze/spray it out and apply through the nozzle. You can use this cement in any weather conditions, even wet weather and also put it on damp surfaces. After waiting for the mortar to cure, you can cover the grey colour with paint to make the group fit seamlessly into your stone colour. That said, buying this Bostik Cementone mix does work out to be expensive if you plan on using it to install a new patio. It’s best used for small areas and repairs. As long as you seal the tub well, you can store the mix in a cool place indefinitely. Covers an area from 2m 2 to 4.32 m 2 depending on the size of the slabs and the width and depth of the gaps between them.

Priming Slurry

The application method is Wash-and-Sweep, as firstly you will need to fully saturate the patio, especially right down into all the gaps between the stones. The manufacturer recommends using a garden hose or other water sprayer to make sure that the wet mixture reaches the bottom of the gaps. Once the gaps are full, turn the hose onto the patio stones off wash off the excess grout. Explore our range of jointing compounds to find the right product for strong, solid joints for domestic drives, paths and patios. Quite a few online reviewers remark that the key to success with this patio grout is to use lots of water, more than you would first think. Open the grout tub and you will find a slurry, a wet mixture of the granules and water.

The grout dries hard enough to withstand your pressure washer and any weeds trying to get through from underneath, yet remains permeable enough to let water pass through it without pooling up. This mortar cement is pretty weatherproof – it stands up to temperatures between -30°C and +75°C and that covers all UK weather normally. This product stores well down to -15°C, especially if you cover the nozzle with adhesive tape to seal it. Pros

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Some online reviewers remark that it’s near impossible to spray all the contents out of the canister, especially the bottom third. Others say that they cut the container open and get at the mortar cement that way. This is useful where you aren’t sure of your maths in working out the ratio for yourself or you have only a small area to grout. It’s not really cost-effective for installing a complete patio; you are better off buying a bag of sand and one bag of cement and mixing them yourself.