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With time and wear, holes can quickly appear in the flange of your freestanding pool.
To seal a hole you must first find it. For this pass a little dishwashing product on the flange and a bubble will form at the level of the leak.
Empty your pool completely.
Then deflate the pudding and cut a piece of air chamber (well cleaned) to the dimensions of the hole.
Feel free to rub your pudding with light sandpaper
Coat your patch with glue and apply it to the hole, keeping it pressed for 2 minutes so that the glue adheres well.
Wait about forty minutes then reinflate the pudding.

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Video Instruction: Above Ground Pool Liner Leak Repair. Finding and Fixing the Hole.