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Rotary veneers are what plywood is made out of and generally produce an appearance that many people don't like. However, they can also come in larger sheets and may be the only option for very large projects. Sliced veneer looks like normal lumber, and allows you to get really beautiful grain detail. You can get random sets of veneers, or you can get book-matched sets. In book matched sets, you get the pieces that were cut one next to the other, so that the grain patterns match up. This can be used to create beautiful designs. However, unmatched sets may look more "natural". You can get veneer sheets that have adhesive already applied to one side. These are the easiest to place. If you get regular veneer, however, you'll need to use the application method discussed in the other section. These are generally applied just like a sticker, but you should read the included instructions to see if that particular manufacturer requires special steps. Veneers are attached to a substrate (or base material). Usually this is either another wood (if you are veneering, for example, panels on doors or cabinets) or it is a cheaper material altogether, such as MDF. These man-made materials are probably the best option, since they usually allow you to save the most money. You can use yellow or carpenter's glue if you want to. If you live in a very dry environment with little humidity, these will work perfectly fine. If you live in a humid environment, however, these glues can cause your veneers to wander. It's better to use a proper veneering glue. Many other methods of veneering use these glues. Be wary of those methods, especially if you live in a humid environment.
Choose a rotary vs sliced veneer. Choose a random or book-matched veneer. Choose your application method. Choose your substrate. Choose a glue.