The plaster surface appears to be less than two to five years old and remains in relatively smooth condition for its age.
However, several unusual conditions are present. Odd growths resembling miniature succulents are emerging or simply on top of and growing from the surface in multiple locations. This is abnormal and warrants attention; the exact cause is unclear.
The surface also shows signs of prior abuse, including prolonged exposure to 3-inch chlorine tablets and a poorly executed acid wash during startup? These factors have left the plaster more abrasive than normal, which promotes adhesion of organic matter—the primary issue currently observed on an otherwise relatively new surface.
The plaster appears to be a high-quality finish originally, likely incorporating glass aggregate intended to produce a shiny appearance. It is possible that the acid wash was not aggressive enough to fully expose underlying glass pebble? while overly aggressive in other locations.
In any case, the surface is not uniform in color or smoothness.
Numerous rust-colored stains (estimated 100–200 or more) are present throughout. These are most likely organic in origin, consistent with staining produced by the large tree on the northwest side of the property. A stain-treatment service (approximately $400 or less) is recommended to remove the stains and to test whether they are organic versus metal or rebar-related.
Additional observations include rust-colored staple stains on the north side of the surface and discoloration emanating from the southeast return, which appears copper-related.
Because of the combination of issues, a reliable expected service life cannot be determined at this time. Reassessment in 6–12 months is advised.
In the mean time recommend stain treatments as outlined.
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