Yes, its a gum powder that you add to fondant, to make it easier to model and makes it set hard when it dries. You use 1tsp per 250g, so 4 tsp for 1 kilo. Couldn't imagine mixing 1kg at a time though, it would be very difficult to knead. Once kneaded, leave it 20-30 mins before modelling with it. If you find it too stiff, mix equal quantities with plain fondant to soften it up
You can also make your own edible glue with it 1 part tylose to 30 parts water, mix in a bottle and leave overnight. It will start off lumpy but will settle.