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I have a leak in my liner. How do I repair it? | Decorative Ponds & Water Gardens Q & A


Q: I have a leak in my liner. How do I repair it?

Q: I have a leak in my liner. How do I repair it?

Catherine – Ballwin, MO

A: Dropping water levels and wet patches appearing around your pond indicate one thing: a leaky liner. Don’t worry. It doesn’t mean you need to rebuild your water garden from the ground up. You just have to patch the leak.

Your repair process starts with determining the size of the leak. Smaller holes can simply be patched; larger punctures or multiple tears need a bit more attention. Here’s what we recommend based on the leak size.

For Smaller Holes …

If you have a small hole in your liner that’s 5 inches or less, you can use the EPDM Pond Liner Patch Kit. It contains everything you’ll need to fix minor tears or holes, including a EPDM rubber patch, solvent wipe, a scrub sponge, seam roller and pair of disposable gloves.

To begin, make sure the surface is both clean and dry. If necessary, relocate your fish in a holding tank while prepping the liner and performing your repair. After the patch is in place, you can top off your pond’s water level, and acclimate and return your fish to their home.

For Tears or Punctures …

To repair smaller tears or punctures without draining your pond, you can use Underwater Pond Sealer. Remember, however, that it has to be beaded on, not smeared on, because it’s a sealer, not an adhesive. When used as directed, it’ll start to be tacky in two to three hours, and fully cured in 48 hours. The sealer performs best in water that’s 60° Fahrenheit.

For best results, clean the surface and make sure it’s free of grease and algae. If necessary, relocate your fish in a holding tank while allowing the repaired area to fully cure.

Then place sealer directly onto the surface you wish to bond/seal. Put two 5mm diameter beads of sealer 100mm apart on the overlap. Gently run your fingers over the line to make sure the sealer has connected both pieces of liner. Do not press it flat, and don’t be tempted to pull it apart to see if it has stuck! Allow the sealer to fully cure before returning your fish to the pond.

For Multiple Tears or Large Punctures …

Larger punctures of multiple tears will require some work. You’ll need to put your fish in a holding tank, drain the pond and adhere a new piece of liner to the existing one. Here’s what you’ll need and how the process should go:

First, you’ll need to purchase a liner seaming kit, a new piece of liner and have some protective gloves on hand. After you’ve repaired the tears and ensured that the adhesive had done its job, refill your pond, and acclimate and return your fish to their home.

Good luck repairing your leaky liner!

Pond Talk: Have you ever had to repair your leaky liner? Tell us about your experience!

Repair Leaky Liners Without Draining Pond - Gold Label Pond & Aquarium Sealer

2 Responses

  1. That’s all great but how do you find a leak in the first place? Our pond is dug down into the ground and there are no visible wet spots.It takes about a week and a half to go down six inches. It’s a large fish pond that’s about 8′ X 25′. Any suggestions on where to start looking?

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