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I have a deck with vinyl posts, and 5"x5" vinyl caps on the posts. I'm looking at how I can affix them to the posts so they don't blow off. I found a "Vinyl Fence Glue" listed at both Home Depot and Lowe's websites, but they are listed as online-only. Amazon has something similar but it is not in stock.

Am I just looking for anything labeled as a "vinyl adhesive"? Since it's going to be outside facing the weather, should I be aware of any qualities to avoid in an adhesive? Would something like Gorilla Glue work? Most "vinyl adhesive" searches end up with a bunch of the canned stuff you brush on but I think I'm looking for some sort of tubed type of adhesive.

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Use clear silicone caulk, super strong as an adhesive when cured and waterproof.

  • I would also try silicone method. Still removable if you really need to. But should keep them on reasonably well. I would not say it is super strong though. – ryanwinchester Oct 18 '14 at 17:26
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Vinyl fence cement is available from Lowes stores. I used it to attach my fence post caps.

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Personally, I'd be inclined to drive a pair of small screws, so I could remove and replace the cap if that ever becomes necessary.

If you insist on a chemical weld, I would bet that the glues used for PVC plumbing would work. Might be intolerably messy, though.

  • +1 for hardware. I don't actually know the reason why but I've never seen caps applied with adhesive , always with screws. Just make sure it's stainless or you'll have rusty stains running down your posts. – user23534 Sep 27 '14 at 3:31
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Here is an idea. Fasten a piece of line to the inside center of each cap with PVC cement and attach a three pound weight weight to the end of the line (you could use a rock I'm a pouch). Then lower the weight into the fence post and the cap can be put back on. This would not be messy, and would allow for easy access if necessary.

Thinking out of the box.

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