An interior stain penetrates the wood's natural grain patterns, while an interior finish sits on top to provide additional protection. Stains are available in translucent or solid colors that can enhance the wood's appearance. Finishes, on the other hand, offer protection from wear-and-tear and can provide a sheen, ranging from matte to glossy.

Consider the type of wood, the desired color, and the level of durability required. Oil-based stains offer rich, vibrant colors and excellent durability, but they require proper ventilation and can be more challenging to apply. Water-based stains have less odor, are easier to clean up, and dry faster, but may not provide the same level of protection as oil-based stains.

Yes, you can apply an interior finish over a stain to enhance protection and achieve the desired sheen. However, ensure the stain is completely dry and follow the manufacturer's instructions for compatibility and application.

Essential tools include brushes or applicators, rags, sandpaper, tack cloth, and a respirator. A sanding sponge or sanding block can be useful for smoothing the surface. For larger projects, a paint sprayer can provide a more efficient application method.