Polyester resin offers the following advantages: 
# Adequate resistance to water and variety of chemicals.
# Adequate resistance to weathering and ageing.
# Low cost. 
# Polyesters can withstand a temperature up to 80 °C.
# Polyesters have good wetting to glass fibres.
# Relatively low shrinkage at between 4–8% during curing.
# Linear thermal expansion ranges from 100–200 x 10 K.