This is new construction that had lots of hairline cracks in the surface of the front and rear porches, and in the garage floor.
The buyer complained of the cracking, so the builder coated the porch surfaces using a product similar to the parge coating used on sides of foundation.
Do you see this often?
I don’t think it will last without cracking and flaking.
From what you are describing, knowing what product they used to make the repairs would be great.
So dependant of what was used, is hard to evaluate the durability and longevity of the finish.
Typically for something like that, a product like this one in the link would be used.
You might want to brouse through it and see if anything helps determine what you saw.
Their are other equivalent products, but all achieve the same outcome along with preparations and applications.
I figured it would be a start.
Hope this helps.
I’ve seen some of this stuff… similar… an enamel or epoxy that appears harder the orgiginal concrete… hard to say how long the stuff will last…
MAINE boyz on the scene here… bwaap!