resurfacing concrete

I have a concrete step on my front porch which had surface deterioration a few years ago. I resurfaced with special mortar that was for doing thin layers. I prepared the old surface with an acyrlic bonder. This job did not last very long. The new concrete separated from the old. This time I am thinking about adding some wire grill to hold the new surface together. I want to bend the wire grill 90 degrees and run it down the riser, since that portion is also deteriorated. Is this a good idea?