Plaster stained and faded color

New2water

LifeTime Supporter
Jun 28, 2011
78
Stockton, CA
Our pool is about 15+ years old and the plaster color is variously faded and stained in some places. I've attached photos of the spa where you can see the stains and faded patches as well as some chipped plaster.
Other than re-plastering, what can one do to restore the color/finish of these surfaces?
 

Attachments