Depending on a variety of factors and how well you maintain your pool, your plaster can last from 7 to 10 years. The average life expectancy of a plastered pool is affected by regular pool maintenance and cleaning. If you take excellent care of pool plaster, such as marcite plaster can last up to 7-10 years while you’ll get an additional five years on the life of your pool is you use quartz aggregate blend for pool plastering.