How do paint absorb oriented strand wood?

Paint absorbs into oriented strand board (OSB) primarily through its porous surface, which allows the liquid components of the paint to penetrate the wood fibers. The rough texture of OSB enhances adhesion by creating more surface area for the paint to cling to. Additionally, OSB's composition of wood strands, flakes, and adhesives can influence how well the paint adheres and is absorbed, often requiring a primer to seal the surface for better results. Proper surface preparation, such as sanding and cleaning, can also improve paint absorption and finish quality.