Primer/sealer for concrete block house?

I am going to be painting a concrete block house with a smooth stucco finish that has lots of peeling paint and a couple of hairline stairstep cracks. Does a primer serve the same purpose as a sealer for prepping areas where the paint has been removed when pressure cleaning or will both a sealer and a primer be needed?
Any recommendations for primers and sealers for this kind of application?
AB S. Fla.
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