PVA is a classic way of glueing all kinds of materials on a diorama base. PVA is good when you need to affix and position a lot of objects and using a CA glue would be wasteful. PVA dries slowly allowing for a lot of manipulation so that you can plan the layout of your base on the fly. Appropriate for materials such as wood, paper, cardboard, minerals. VMS PVA has improved formula and dries two times faster than old school PVA you might have used and what's more important the joint is much less milky!
FAQ & How to Use Product Overview on VMS site