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We alway recommend using a priming slurry when laying slabs and tiles (especially for non-porous and low-porous paving) to provide strong bonding/adhesion and prevent “picture frame” stains and patches from bedding cement/mortar.
Good landscapers and builders avoid dot and dab mortar bedding because of weak bonds and void marking. They also ensure that as well as using a full mortar bed, they are also applying priming slurry to the slabs/flagstones to ensure strong adhesion and bonding. This is best practice and should be done for all types of slab, regardless of porosity.
You must use a priming slurry when installing porcelain paving as it is non-porous and without the primer, the bonding will be very weak and lead to slabs and tiles coming loose where the mortar bed does not adhere properly.
For cladding tiles (porcelain and natural stone) we recommend using a cladding adhesive rated to BS EN 12004 C2FT S1 to ensure it has C2 improved adhesion, FT fast setting and anti-slip properties and S1 flexibility (deformable) characteristics.
For interlocking modular walling systems that stack/interconnect with male-female couplings, surface areas between bricks tend to be smaller (as the rigidity/connectivity is partially being supplied by the structure of the bricks). In these circumstances the surface area upon which adhesive materials can be applied is smaller, so a stronger high-performance bonding agent is recommended to ensure a secure bond.
