Polyurea forms a liquid coating applied hot and then allowed to dry to form a watertight seal. These sprays are more flexible than other options but also more expensive at $2.60 per square foot. Spray-inĪ spray-in seal is a liquid synthetic coating, usually rubber, applied as a spray and then allowed to dry. PVC forms a synthetic vinyl that stays flexible at most natural temperatures and is safe for aquatic life, making it popular in fishing and natural swimming bodies of water. It is inexpensive at $0.85 per square foot.

EPDMĮPDM serves as weather-resistant rubber, safe to have around fish and aquatic plants like found in koi and fishing ponds. The average price is between $0.25 and $1.30 per square foot. Firestoneįirestone sells EPDM liners in a variety of sizes. It lasts for a long time for only $0.62 per square foot. High Density Polyethylene is a form of rubber used in the liners of large projects like farm ponds. It's difficult to install correctly the first time for novices and often needs replacement because of DIY errors. The clay interacts with water to form a tight seal. Bentonite Clayīentonite clay costs $1.15 per square foot and forms an active liner that can be reapplied easily. It might degrade from the weather and sunlight. People usually find plastic in premade garden or koi ponds. Rigid plastic is used on only small liners and is inexpensive at $0.75 per square foot.

It tears easily and might degrade from sunlight. It is easy to install and works well in small ponds. Resource Centerįlexible rubber costs about $0.50 per square foot on average, making it one of the cheapest options. Find hiring guides, material costs, expert advice, how-to's and more.

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