Hardwood Moulding Materials The first thing you’ll find as you shop for hardwood moulding products is a wide range of base materials. For instance, hardwood mouldings may be made from knotty alder or popular, as well as a range of other options that offer flexibility and improved strength. Some types of hardwood have striking grain patterns which are meant to be sealed or stained, while other moulding materials are better off when they are painted. This is especially true of the more flexible mouldings that are made by splicing sections of wood together. If you are set on painting or staining your mouldings a specific color, you should definitely ask about which products will handle these processes best. You don’t want to overpay for mouldings with a dramatic grain pattern only to end up painting over it.