Are you talking about the large tarps they sell at Wal-Mart or Lowes?Hi
have used fiberglass tarps . One lasted over 20 years with 3 feet of depth. While you can use the the roll plastic two major drawbacks , easily penetrated and degrades in direct sun. A 12x 15 tarp cost under 25 bucks . main drawback is the color s bright blue ,Orange,silver and a sickly brown lol. gary
How long have you had that liner? Is it a "real" liner? How big is the new pond going to be? No matter the answers to these questions I 100% recommend getting the proper 45mil liner. If it is a small pond then the price won't be too high, if it is a big pond you REALLY don't want to have to redo it again anytime soon. Just recently I had an uninvited 130lb cane corso (dog) with long nails fall into my 3.5ft deep pond while no one was around and she got out on her own scratching the sides of the pond liner. I could see the scraps in the algae but amazingly there does not seem to be any holes. I am SO thankful I didn't cut corners cause that liner is amazing!my pond liner has started to leak and I was wonder if you could use that 5 mil plastic that comes on rolls at Home Depot and Lowes. It is a lot cheaper and I could double it up.