How can I prevent staining before or after assembly?

To prevent staining before or after assembly, you can apply a protective sealant or finish to the surface of the material. This will create a barrier that helps repel stains and make it easier to clean. Additionally, you can use coasters, placemats, or tablecloths to protect surfaces from spills and stains. Regular cleaning and maintenance can also help prevent staining by removing any spills or debris promptly.