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Read the concrete packaging to find out how to mix it. The ratio is usually about 1 part water to 3 parts concrete. Add the water and concrete to a mixing container, then use a wooden stirrer or electric paddle mixer to combine them into a thick liquid. The mixing ratio may vary depending on what product you own, so check the manufacturer’s recommendations to get the concrete to the proper consistency. If you got a bag of concrete and mixed it normally, you should use a concrete bonding adhesive to ensure the layers of concrete stick to one another. The adhesive is a liquid that comes in a plastic jug and you pour it directly into the concrete mixture. Check the manufacturer’s instructions to add the product at the recommended ratio.  You can get the additive online or at most home improvement stores. If you are using a concrete patching product, you most likely do not need the adhesive. It is often included as part of the patching mix. Check the product’s label to make sure. Pour concrete onto the existing slab until it is around where you want the final level to be. Make sure you have enough concrete to fill the entire area to the depth you desire. Add all of the concrete right away so none of the mixture has a chance to dry out.  You do not need to wait for the scratch coat layer to dry completely. It will have dried enough while you mixed this batch of concrete. You can try to fill in a slab with multiple pours of concrete, but this usually isn’t advisable. You won’t get a single, uniform slab, which can lead to bonding issues in the layers. The concrete needs to be leveled out before it solidifies. You can use a trowel to smooth over small areas or a screed board and bull float for large areas. Work back and forth, passing over a little more of the rough concrete each time. Make multiple passes over the entire surface to ensure it is smooth.  On hot days, the concrete can dry out very quickly, so don’t waste any time after pouring it. Make sure there are no marks left in the concrete when you are done smoothing it. A good curing compound is the best way to preserve wet concrete. Mix the curing compound according to the manufacturer’s instructions, add it to a garden sprayer, then spray it directly onto the concrete. This should be done right after you finish pouring the concrete. Concrete takes about 7 days to fully cure.  Another way to do this is to spray the concrete thoroughly with water from a garden hose, then lay a polyethylene sheet or concrete curing insulation blanket over it. Make sure the plastic is flat against the concrete or else it will cure unevenly, causing discolorations. Remove the sheet to moisten the concrete again every day for a week.  The longer the concrete is allowed to cure, the stronger it will be. Make sure no one is able to step on the concrete until it has finished curing.
Mix a batch of concrete according to the manufacturer’s instructions. Add a bonding adhesive if you are using regular concrete. Apply the new concrete over the primer. Use a trowel to smooth out the concrete. Protect your work by spraying the concrete with a curing compound.