Parging on any outside masonry usually doesn't last very long in climates that are subjected to heavy freeze & thaw. It's likely to be something you have to keep up on a yearly basis. Just make sure you get everything loose off, and follow the directions of your product closely. Most recommend you wet the masonry a little before application so it will bond better.
Is this a mortar troweled directly to the block or a stucco over a wire mesh?
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