Preformed Pond Material: PVC, Not Polyethylene—Foam Adhesion Test

Material

Home Depot preformed ponds are typically PVC (polyvinyl chloride), not polyethylene. Pond foam (expanding polyurethane) adheres poorly to both.

Test Before Building

1. Sand a small area with fine grit.
2. Apply foam to a scrap of liner.
3. Wait 24 hrs; test bond.

Better Waterfall Attachment

Use a separate EPDM liner for the waterfall, overlapped and sealed to the preformed pond with EPDM seam tape/primer. Mechanical fasteners (stainless screws with washers) through the liner into the preform's lip add security.