Best Sealer Pond Liners in 2026

Water proof formula suitable for use in a wide range of climatic environments from hot to freeze/thaw conditions

Specifically designed for underwater use and to be non toxic and fish and plant safe

Self priming formula allows for reliable adhesion for a finished surface that is easy to maintain

Water proof formula suitable for use in a wide range of climatic environments from hot to freeze/thaw conditions

Specifically designed for underwater use and to be non toxic and fish and plant safe

Self priming formula allows for reliable adhesion for a finished surface that is easy to maintain

Marine grade Silicone that Seals Leaks in Ponds & Aquariums

Black Color

Fits into caulk gun

3 Cans: Seal gaps and fill voids between streambed & waterfall rocks and stones

Stabilizes rockwork in Koi ponds, water gardens and pondless waterfalls

Moving water travels over (not under!) rocks and stones for dramatic visual effect

【PROTECT YOUR POND】- This liner will help to contain your pond, while also creating a safe and healthy environment for wildlife and plants. Help take care of your water features, pond pumps, filters, and more with the liner in place.

【SAFE MATERIAL】- Made of good quality HDPE, our liner is UV and puncture resistant, can be used for many years; Environmentally friendly, safe for your fish and plant.

【PLIABLE AND FLEXIBLE】- Conforms to a variety of irregular surfaces. Excellent choice for water gardens, fish ponds and backyard waterfalls. This light weight liner is easy to install.

Seals Leaks in Ponds, pools, spa's or filter boxes

Pressurized to get into tight spaces

Black Color 2.53 Fl Oz or 75 ML

BRAND NEW

REPACKAGED FROM BULK SUPPLY, FACTORY BAG NOT INCLUDED

SEAL POND AND EARTHEN STRUCTURES GROUTING OF GROUND SOURCE HEAT LOOPS

【Sturdy and firm】: Tough, can withstand a certain degree of stretching, 14.5 mil thickness, not easy to be punctured.

【Applicable scenes】: This PE pond liner can be used for courtyard waterfalls, outdoor fish ponds, garden fountains, and other landscape ponds.

【Size】: 10' x 13' for medium-sized ponds, can be easily divided into the size you want. The 10'x13' pond liner is suitable for small to medium sized ponds, and in most cases will cover 1 5'x7' pond; you can also make it fit other sizes by cutting it.

Package contains 6 tubes of Firestone Lap Sealant

Each tube fits into a standard caulking gun for easy application

Product helps form a watertight seal between splice tape and pond liner

[HDPE Safety Material]: Koi pond liners made of high quality hdpe material are malleable and flexible, and not easily punctured and plasticizer free for long-term use in outdoor ponds.

[Koi Conservation]: Built to Protect. Made with durable HDPE, our pond liner stands the test of time in water!designed to stress cracking and withstand tears, chemical spills, and harsh environments, you don’t have to worry about water leakage and not affected by microorganisms.

[Wide Application]: Conforms to a variety of irregular surfaces. Excellent choice for projects like retention ponds, above and below ground water containment, and for water gardens, fish ponds and backyard waterfalls with gently sloping sides and smooth contours.

RUGGED HDPE MATERIAL -- The pond liner is made of 100% virgin HDPE with UV treated. HDPE is harder and offers higher strength and better resistance to heat than LDPE. Offers greater rigidity and durability and displays excellent chemical resistance. It protects against the sun and the weather. It inhibits harmful substances from seeping into the pond, giving your fish and plants a safe living environment.

SUPERIOR PUNCTURE RESISTANCE -- With the thickness of 20mil, this pond liner is strong enough to be placed on rocky ground. It can withstand extreme weather conditions, is more durable, tear-resistant and puncture-resistant. Neither too stiff and wrinkly nor easily penetrated by sharp rocks or stones. It is designed for economical, safe containment of contaminated soils, liquids, or sludges.

GOOD FLEXIBILITY -- Our fish koi pond liner is 15 x 20FT dimension, has good flexibility, easy to bend and fold to fit the contours of pond rocks & walls. The liner can be stretched around corners to fit nearly any pond design. You can cut your small pond to any size you want. For better flexibility, recommended to place this koi pond liner under the sun for 10 to 15 min before use.

Aging-proof of 10ft x 13ft Pond Liner: Designed with excellent durability, impact strength and high tensile. The size of 10ft x 13ft is ideal for small ponds. The lifespan can live up to 50 years without any exposure, and it can also last for ten years under intense sunlight.

Safe LLDPE Material: Made of LLDPE material, sunlight-proof, weather-proof and pro-environmentally. It can restrain the penetration of harmful substances into the pond and give your fish and plants a secure living environment. Environmentally friendly, safe for your fish and plant. We provide small to large three different sizes for different demands.

20 Mil(0.5mm)Thickness & Easy Installation: Specially designed 0.5mm thickness can block soil and water, preventing dirty substances from penetrating into the pond, effectively retaining water. The thickness is strong enough to put on rocky ground. It will neither not be too stiff and wrinkled, nor will it be easily penetrated by sharp rocks or stones. Freely Bending or folding, the liner can be stretched around corners to fit nearly any pond design. Easy to install, no tools required.

Package Includes: you will get a pond liner, which size is 10 x 10 Ft, 40Mil and holds up to 200 gallons; Especially designed for small ponds, also you can cut to any size you need; Easy installation, no tools required

Guard Your Pond: the pond liner prevent harmful substances in the soil from penetrating into the pond, avoid pollution of water resources, creating a safe and healthy environment for plants; Ideal for your water features, pond pumps, filters, and more with the liner in place

Reliable Material: our black pond liner is made of EPDM material, which has good softness, extensibility, UV and puncture resistant. It can withstand extreme weather conditions, more strong, tear resistant and puncture resistant, can be applied for many years, safe for your fish and plant

LEAKY POND OR WATER FEATURE - Ponds will eventually spring a leak. Whether it’s Concrete, EPDM or Wood Liquid Rubber NeoPond Sealant is a liquid applied coating that cures into a seamless waterproof membrane

FLEXIBLE HEAVY-DUTY COATING - UV stable and easy application of a waterproofing sealant for a fully submersible water feature or pond, fish and plant safe. KIT INCLUDES: One 5 Gallon of Neopond Waterproof Sealant, One 1 Gallon of EPDM Primer, One 1 Gallon of RV Smart Cleaner, and One Roll of 4"x50' Seam Tape

ENVIRONMENTALLY FRIENDLY - Liquid Rubber NeoPond Sealant is water based, containing no Solvents and ultra-low VOC's

Premium Sealant that bonds instantly to many surfaces to create a water tight seal.

Can be used for rubber pond liner repair and rigid preform pond shells that have cracks.

Also can be used on: Most PVC's, metal, tile, stone, brick, concrete and wood.