I'm looking for some advice on how I would properly prepare an existing 4" concrete slab (8mx2.8m) which I require to be "topped" to achieve a level surface ( the slab is presently sloping to one side for drainage for eventual tiling. The slab is in very good condition & I have already gone over it with a small concrete grinder to clean it up. The topping depth will vary from virtually nothing on the high side to to 50mm on the low side. I'm intending to use a concrete bonding agent as a primer on the existing slab & then get in the readymix truck.
Do I need to do something more to achieve a proper bond?