Swimming pools blog

Hi All,
I have an indoor pool in England, The plastic liner is approximatly
15 - 20 years old now and become pourous, is there any way of treating
the liner with a type of paint to reseal it, also taking into
consideration that i am using chlorine in the pool
Or would it be cheaper or better to plater/cement line the pool or
replace it with a new plastic liner?
thanks in advance.
Barry