Address rust stains at cracks via treating exposed rebar, casting off corrosion

https://wool-wiki.win/index.php/Proper_Substratum_Prep_Prior_To_Using_Plaster_Spots_in_Cracked_Pools

Address rust stains at cracks by using treating exposed rebar, taking out corrosion, and encapsulating steel to stay away from future growth and spalling.