The time to replace a pool liner is when you have had enough of the liner. That sounds a little flippant, so what the heck does that mean? Well there are several reasons to replace a liner any of which are valid and all relate to you the owner. The first most common reason to replace a liner is the pool is leaking and will not stop. You have hired a diver and they cannot find any leaks and leaks and will not stop or there is a major cut in the liner. The next most common reason is the printed pattern on the liner is substantially faded or gone. This happens from UV light exposure and high chlorine levels over the years. Most people just hate looking at a faded liner and want to but vibrancy back in their pools appearance. Another scenario is the pool water chemistry has been poorly maintained and the liner is badly wrinkled. With chemistry there are two critical balances Total Alkalinity and Calcium Hardness. If the Total Alkalinity & pH are kept too low over to long a period of time the liner will wrinkle badly and this problem can only be corrected by replacing the liner. If the Calcium Hardness is maintained too low for to long a period of time the liner can become brittle to the point if you step on it the liner would crack. So it is recommended that you have your pool water professionally tested at least 3 times a pool season if your season is 6 months long and 6 times a year if you have a 12-month season. The least common reason is the people just hate the pool liner pattern and want something different. This can happen if someone buys a house and hates the liner pattern that is currently in the pool when they purchase the house so they replace it. The average life of a liner is about 10 years. The longest I have ever heard of a pool liner lasting was 25 years this was an in ground pool, of course there was no pattern in the liner for the last 15 years but the owners did not care. So as you can see the time to replace the liner is your choice. Keep in mind when replacing a liner the thicker the liner the more resistant to punctures the liner will be. If you are in a cold climate you will need a really thick liner. Standard mil thickness on in ground pool liners is usually 20 mil, 27/28 mil, 30 mil and 40 mil. For above ground pools life expectancy is 5-10 years. Liner thickness generally runs 16 mil, 20 mil, 22 mil and 27 mil.
When you say a "pool liner" I am assuming you mean a vinyl liner as normally called a liner for short. If so then no, the liner cannot and should not be painted.
Our pool liner is ripped and needs to be replaced. Where can we purchase liners for an above ground pool?
Well i have a pool myself, and sand is not wanted in it. The rocks in it can puncture the liner (if it has a liner). You should vacuum it out with a pool vacuum. Hope i helped
Yes but its not recommended. You would have to replace the liner very soon. I have a customer who spent almost 60 grand on a pool were the liner was placed over concrete and now 4 years later she is spending almost 6 grand to replace the liner and redo the pool with vermiculite. Best bet is to refinish the pool with either gunite or vermiculite pool crete and then put in the liner. A liner can last ten to fifteen years before having to be replaced and then when it is replaced, it looks like a brand new pool.
You can use the same hole in the ground for both a vinyl liner pool and a gunite pool. You should not need a new hole dug.
form_title= Pool Liners form_header= Protect your pool with a new liner. What is square footage of the pool?*= _  When was the lining last replaced?*= _  How old is your pool?*= _ 
The reality is that the average inground pool liner will last 8-12 years.
how can i remove algae from my pool liner, I have treated the water but algae remains on my liner
no, replace liner
There are many places where one can buy a pool liner. One can buy a pool liner at popular on the web sources such as Liner World, USA Pool Pros, and National Pool Wholesalers.
form_title= Pool Liner form_header= Replace or install a liner for your pool. Do you need to replace an existing liner?*= () Yes () No Is it an in-ground or above-ground pool?*= () In Ground () Above Ground What is the size of your pool?*= _ 
The pool liner pad is placed underneath the pool liner to prevent items from cutting through the liner. If the liner is already leaking, the liner pad will not stop the leak.