Artex is a water based paint that is applied on walls or ceilings. Artex can be removed by steaming using a wallpaper steamer. Steaming will soak it and you will be able to strip it off without damaging the surface you are working on. It could also be removed by a product call Ex-Tex which is painted on top of the artex and can easily peel off.
You can remove artex by steaming using a wallpaper steamer. The only disadvantage is that it can be slow and messy. Artex is a water-based covering, usually used to decorate ceilings.
You can remove artex using a steam stripper and scraper. However, this method is not easy and usually leaves some damage. You can use products such as X-Tex to paint over the artex.