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How To Permanently Join Pond Liner Sections Using Primer And Splicing Tape

Installing a pond liner isn’t difficult, but you must be certain the seams between liner sections are waterproof. Creating seams is a multistep process that requires the installer to exercise care and pay attention to each detail along the way. Fortunately, by using modern materials and the right tools, you can be successful in your efforts to join liner sections; keep reading to learn more about how you can do it:

Tools and materials needed

  • Overlapping pond liner sections

  • Double-sided pond seam splicing tape

  • Pond liner primer

  • Two-inch wide paint brush

  • Rubbing alcohol

  • Shop towel

  • Wallpaper seam roller

  • Scissors

  • Measuring tape

  • Air compressor with blower gun

Step-by-step procedure

1. Lay out the pond liner: Lay the pond liner in your pond in sections and create overlapping edges. 

2. Trim the overlapping sections to size: Measure from the edge of the underlying section and cut the top liner so it overhangs by 4 inches. Try to make the cut as straight and even as possible, but don’t worry if there is a small deviation of less than an inch in either direction. Once you have cut the overlapping section to size, allow it to sit undisturbed for at least half an hour to permit the material to settle.

3. Clean the edges: After trimming the pond liner, dampen a shop towel with rubbing alcohol and wipe down the edges of the liner sections to remove any oil, grease or dirt from the material. Allow the alcohol to evaporate completely before proceeding to the next step.

4. Apply primer to the pond liner sections: Once the liner edges are clean, grasp the top liner section and fold it back over on itself to create a two-inch wide strip. To keep the folded strip temporarily in place, use a small paintbrush to apply tiny dabs of pond liner primer to the back of the strip to hold it down. Just be careful not to use too much primer, so you don’t make a mess or risk damaging the liner.

When you have folded and “tacked” the strip down, use the paintbrush to apply primer to the exposed backside of the two-inch wide strip. Next, measure from the edge where the folded top section meets the bottom section and apply a three-inch wide coat of primer to the topside of the bottom liner. Be sure to cover all the appropriate areas with primer, but keep the coats relatively thin.

5. Install the double-sided seam splicing tape: After the primer has been applied to the liner sections, measure off a total length of double-sided seam splicing tape equal to the length of the seam to be created. Slowly and carefully lay the strip of tape down on top of the primed bottom section, so there is between ¼ and ½-inch of tape still exposed when the top section is folded down. Leave the liner in place on top of the tape until directed to remove it in step 6.

6. Finish joining the seams: To join the seams, grasp the overlapping strip that you tacked down in step 3, pull it up from its temporary mount and push it down on top of the strip of tape. At the same time, slowly pull the top liner from the tape to expose the adhesive that will grip the primed liner. Push the edges together with your fingers, but also roll across the seam with a wooden wallpaper roller to remove wrinkling and gaps.

7. Test the seams: After the seams have been joined, blow a jet of 50 pounds-per-square inch of air into the seams to ensure they hold. Do not exceed 50 pounds of air pressure, however, or you may tear the liner material.

For more information about pond liners, contact a company like Billboard Tarps.