>>8074829>>8074859Depends on the kit. in general cement is 100% not needed, maybe useful to secure parts that are loose or fiddly and don't need to be(ie stuff that is suppossed to be removable like weapons or armor), but really not actually a neccessity for the build. Of course if you pose a lot keep some cement ready just in case you discover their are small parts that fall off too easily.
There are however a few exceptions where you do need cement according to the instructions. For example, 46 in pic related for the HMM Lightning Saix. those claws can still fit together without cement, but they tend to fall apart way too easily and the instructions do indicate the cement icon for it.