Joining Pond Liners: Seam Tape, Not Silicone

Primer: Clean and prime both liner edges.
Seam tape: Apply 3–6 inch wide double-sided seam tape.
Cover tape: Overlay with single-sided cover tape for protection.
Roller: Press firmly with a silicone roller.

Correct Method for EPDM Liners

Silicone/aquarium sealant fails on large liner seams—it lacks elasticity and UV resistance. Use purpose-made EPDM seam tape system:

Aquascape Designs (aquascapeinc.com) sells complete seam kits. Order enough for your shelf addition plus 10% extra.

A failed seam drains the pond. Invest in the right materials.

Pond and Water Gardening: Pond Liner vs. Concrete: Which to Choose?; Clearing Green Water in a Fishless Pond; Fixing a Murky Concrete Pond Without Fish; Restoring a Neglected Backyard Pond for Safe Swimming; pH Adjustment for Fish Transfer: Raise Old Pond, Not Lower New; Overwintering Pond Goldfish: When to Bring Them Inside; Sudden Koi Deaths in a Large Pond: Looking Beyond Water Tests; Two-Tier Hillside Pond: Gravity Flow, Barrel Biofilter & Builder's Bible; Expanding Your Pond: A Stress-Free Transition Plan for Fish, Plants, and Frogs; Sizing a Pump for an Expanded Pond and Creek System

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