Yes, but you can usually remove the exposed parts and replace with "Deck O Seal" or similar product
If the decking shifts,rises and moves it will push on the coping of the pool. Also, this helps keep water from under the pool and if the ground has moisture until it and freezes then it cause the deck to rise.
Concrete deck and or terracotta paver's work well As well as simple harwood decking if you prefer a natural look
Sand it down and paint it.
visit google. type in doughboy plastic coping. 24" strips are around 60 cents.
The tiles surrounding a pool decking are commonly referred to as "coping." Coping serves both functional and aesthetic purposes, providing a finished edge to the pool and helping to prevent water from seeping into the pool deck. It can be made from various materials, including stone, concrete, or ceramic, and is designed to withstand the elements while enhancing the overall look of the pool area.
W.R. Meadows Co. makes a product called Deck O Seal that will do the job of filling the gap between pool coping and cement deck.
It depends on the pool make. The only one I know of that offers a plastic "coping cover" is Pacific Pools, now owned by Latham Plastics in Latham, NY and it is only for their older "Garden Pools". Your aluminum coping can easily be reconditioned with an epoxy spray paint from the hardware store. If there are defects, fill them with a two-part epoxy putty and sand it to blend with the rest of the coping before painting. Mask the coping off with painter's tape to keep from painting the deck or liner. Hank4pools@aol.com
We use the coping saw as a hand saw, so it is pretty easy to control the saw. If you use the coping saw, you can feel that the coping saw is very easy to control,the saw can basically cut any shapes. Some machines are very hard to cut curves with on plastic, but not this one because the coping saw just follows where you go, you are controlling the angle of the blade of the coping saw.
Salt reacts with metals in an unfriendly matter. Just ask anyone who lives near an ocean or in the snowy/icy north where they put salt down to help clear the roads. With this in mind, I'd choose any bullnose coping that isn't made of metal. Choose a bullnose that is made of plastic, porcelain, brick, natural stone or plastic coping.
Unless it is in a place where you can glue it and it will not be noticable I would try to replace it. If you have the piece you can use a plastic welder to repair it.
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I have a feeling that what happened to you is exactly what happened to me, but it's not the gunite that dropped. Your pool deck rose. I wondered the same thing. It's kind of an optical illusion. The ground froze under the decking and caused it to push up. Thank goodness for that expansion joint between the decking and the coping, or my coping would have all broken off into the pool. We had a few little edges crack off which will require some minor repair, but like yours, our decking did go back down after a few days of warmer weather. Scared the you-know-what out of me when I first saw it, though. My pool guy said that the gunite is so thick, it's not going anywhere. Good luck!