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Title: Wow, works great
Review: This is more like a contact cement than a "primer". I used it with some of the double sided tape sealer to join my pond liner. You can find directions on the Internet, but basically I poured some of this on one of those abrasive scrubber pads, and scrubbed the area to be joined (both edges of the liner). This insures the primer adheres very well to the liner. Then I unrolled the double sided tape, leaving the paper on one side still. This was on top of a 2x4, so the liner was flat and even. Then I folded the other liner on top of the tape (which also had the primer on it), and pulled the paper off the tape. Then I pushed the liner smooth together with my hands, then used a heavy roller to push the liners together hard. I can't imagine it will ever leak.
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