Repairing a Cracked Preformed Pond Tub with Silicone

Procedure

Drain and dry thoroughly.
Grind a V-groove along the crack with a Dremel/burr.
Apply 100% silicone sealant (aquarium safe) generously into groove and over surface.
Smooth with finger; let cure 24–48 hrs.
Refill slowly; monitor.

Only works on rigid plastic/fiberglass, not polyethylene. If it's PE, replacement is needed.

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