Gyprock Cement For Filler/Smoother in Interior

Hi, I have my interior to paint in older house and there is a lot of work needed to be done on the walls to get rough patches smooth. I have this big container of Gyprock Pre-Mixed Total Joint Cement which is what I was going to use to use like that filler you can buy in smaller packets that you mix with water to get a plaster mix. Can this Gyprock cement be used like the filler so I can smooth it over rough parts of the walls and over small holes and dents etc? The guy at Bunnings sold me this months ago but I have only just got around to starting this but I'm not sure they sold me the right thing now? I live a long way so taking it back would be difficult plus it's been so long.

Would this cement be able to be opened and used later etc as this is a huge 15kg container so I would only need to use small parts at a time?


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